Some of the Examples of homeostasis Are the maintenance of internal body temperature in humans or a thermostat, in technology. It is the body’s attempt to maintain a constant internal environment. Maintaining a stable internal environment requires constant monitoring and adjustments as conditions change. " For example, all the cells in the human body function best at a temperature of around 37°C. Answer: Homeostasis is the state of maintaining a stable. Similar processes dynamically maintain steady-state conditions in the Earth's environment. Homeostasis is the maintenance of relatively stable conditions Ensures the body’s internal environment remains steady despite changes both inside and outside the body. What is homeostatic state? In biology, homeostasis is the state of steady internal, physical, and chemical conditions maintained by living systems. Homeostasis is the condition in which a system (such as the human body) is maintained in a more or less steady state. Just as our bodies, like those of all mammals, maintain a relatively stable internal tempera-ture despite changing conditions, the Earth system keeps its temperature and atmosphere components stable. Intercellular communication among cells in a tissue helps the. Homeostasis is the maintenance of stable internal conditions in a changing environment. Need to know anatomy similar to physiological systems relationship between structure and function. Thermoregulation is the ability of an organism to keep its body temperature within certain boundaries, even when the surrounding temperature is very different. Jan 13, 2016 · is the state of maintaining a stable internal environment despite changing external conditions. Changes in blood calcium level have the following effects: When blood calcium is low, the parathyroid gland secretes parathyroid. Environmental factors such as sustained intake of a high-fat, high-carbohydrate diet may drive the gut microbiota into a state of dysbiosis that may. Homeostasis is a process of maintaining a constant internal environment despite changes in the external environment. The endocrine system provides an essential mechanism called homeostasis that integrates body activities and at the same time ensures that the composition of the body fluids bathing the constituent cells. Given that plants cannot usually actively move to places of more favorable environmental. The body has a range of receptors these are used to constantly monitor the body's internal conditions. [6] Allostasis considers the normal daily variations that exist in the internal system. Individual cells, as well as organisms, must maintain homeostasis in order to live. answer choices. Mar 22, 2022 · Homeostasis is the condition in which the body maintains a state of equilibrium ( a stable internal environment) as it deals with external changes. Homeostasis defines as a mechanism which maintains a constant body environment for optimum body function. Every organism possesses a mechanism for maintaining and restoring homeostasis of the body. Homeostasis refers to the ability of a system to maintain a consistent, stable internal state across a range of external conditions (Cooper 2008, Meunier et al. , 2009, Navon and Ciechanover, 2009 ). This is called homeostasis. organisms maintain a stable internal environment despite changing . There are mechanisms in organisms . A coordinator formulates a suitable response to a stimulus. A thermoconforming organism, by contrast, simply adopts the surrounding temperature as its own body temperature, thus avoiding the need for internal thermoregulation. Typically, we understand that our body's ability to regulate temperature is very important. However, it remains unclear which specific physiological variables are being stabilized and which cellular or neural network components compose the homeostatic machinery. Aug 20, 2022 · Homeostasis refers to the body's need to reach and maintain a certain state of equilibrium. organisms need the process of homeostasis i-e the changes in the internal environment within a narrow range as a response to wide range changes in the external environment. :) Find Biology textbook solutions? Class 12 Class 11 Class 10 Class 9. the maintenance of a relatively stable internal conditions despite continuous changes in environment. Homeostasis and Cardiovascular System. Keeping a stable internal environment requires continually monitoring the internal environment and constantly making. Changes in blood calcium level have the following effects: When blood calcium is low, the parathyroid gland secretes parathyroid. Instead, it indicates a dynamic state of. When a blood vessel is damaged, platelets attach and recruit more platelets to the area. “Homeostasis is from the Greek word. Materials: There was only a few materials used in this lab: -Stopwatch. However, the concept of the constancy of the. These stable physiological states can be thought of as predictions of homeostatic systems. Homeostasis Homeostasis is the state of maintaining a stable internal environment despite changing external conditions. Slide 1H OMEOSTASIS Homeostasis is the body’s ability to keep the internal balance of the body stable. All living organisms, whether unicellular or multicellular exhibit homeostasis. , 1999). HYPOTHALAMUS • The hypothalamus is the part of the brain that controls many body functions. ” These “right” conditions are maintained by the body through , the state of maintaining a stable internal environment despite changing external conditions. a change in the method of cellular respiration D. • Glucose , Carbon dioxide, Water, Salts, etc need to be kept. Jan 13, 2016 · is the state of maintaining a stable internal environment despite changing external conditions. • and carbon dioxide concentrations • of internal environment • Nutrient and waste product • Salt and other concentrations. It is the maintenance of a constant internal environment despite changes in internal and external conditions. In a nutshell, the internal variables of a homeostatic biological system are robustly regulated to remain within a prescribed operating range even in the presence of external perturbations. reproduction is the process of reproduction in cells without joining gametes (or sex cells). Homeostasis is the tendency to resist change in order to maintain a stable, relatively constant internal environment. It is the system that creates homeostasis within the body. , not 'closed' or 'isolated' from their. Changes in the external environment can cause these variables to change. Homeostasis is the process by which the living organisms are able to keep the conditions inside themselves constant despite any changes in the outside environment. Homeostasis and Cardiovascular System. M2: Discuss the probable homeostatic responses to changes in the internal environment during exercise D2: Evaluate the importance of homeostasis in maintaining the healthy functioning of the body Homeostasis is the process the body takes to keep the body in balance and ensures that there is a stable environment in which cells can. Aug 20, 2022 · Homeostasis refers to the body's need to reach and maintain a certain state of equilibrium. eq; sl. • Hairs on the skin lie flat so heat can escape from the body. HomeostasisHomeostasis is responding to changes in the conditions of the external environment and the internal environment. Homeostasis refers to stability, balance, or equilibrium within a cell or the body. The concept was later expanded upon by the American physiologist Walter Bradford Cannon who termed it “homeostasis” which translates to “steady state” or “unchanging. Homeostasis is the tendency not to stray from the range of favorable or ideal internal conditions. mechanism used to maintain homeostasis, or dynamic equilibrium. is the state of maintaining a stable internal environment despite changing external conditions. This statement relates to the universal trait of living organisms. in physiology, a relatively dynamic constant state with respect to the composition and properties of the internal environment and constancy of the basic physiological functions in man, animals, and plants. The chemical signals such as hormones neurotransmitters or cytokines serve as molecules that aid in sending signals to the internal organs or tissues of the body. An example of homeostasis is the human body keeping an average temperature of 98. An example of homeostasis is the human body keeping an average temperature of 98. Homeostasis refers to the relatively stable state inside the body of an animal. Weegy: Responding to the environment by maintaining a stable internal environment despite changing external conditions is called HOMEOSTASIS. Despite changing cell size significantly, neither the mutants nor overexpressor produced a significant change in RGR (Supplementary Fig. action throughout the body, as well as all cell functions. Body Temperature The normal body temperature is between about 36°C and 38°C. is the state of maintaining a internal environment despite external conditions. ) the exchange of materials with the surrounding environment. All living organisms, from plants to puppies to people, must regulate their internal environment to process energy and ultimately survive. Homeostasis is simply the maintaining stable internal environment in an organism despite the changes that occur in the external environment. Maintaining homeostasis requires that the body continuously monitor its internal conditions. It is the balance and regulation of our bodies compensating between forces exerting a push one way and a pull the other. In biology, the term homeostasis refers to the ability of the body to maintain a stable internal environment despite changes in external conditions. Homeostasis is the ability to maintain a relatively stable internal state that persists despite changes in the world outside. “According to Merriam Webster Dictionary, the definition of Homeostasis is the relatively stable state of equilibrium or a tendency toward such a state. Homeostasis is a general phenomenon of organisms. Homeostasis is defined as maintenance of internal environment of an organism to deal with the environmental changes such as physical chemical and biological. a decrease in the amount of glucose in the blood B. Plants absorb water from the soil and use it to maintain homeostasis. Maintaining homeostasis requires that the body continuously monitors its internal conditions. This is a natural response to changes in the. Features of a steady state:. Log In My Account rq. The literal translation of homeostasis is "unchanging"; however, the term does not actually mean a static, or unchanging state. Homeostasis is the maintenance of stable internal conditions in a changing environment. Properties of systems reflect the system as a whole and are not solely determined by the identity of the species in the system. This state of constant conditions can be called equilibrium, or steady state. All living organisms, from plants to puppies to people, must regulate their internal environment to process energy and ultimately survive. For example, an organism needs to regulate body temperature through the thermoregulation process. As your body converts food into energy during exercise, it produces heat as a waste product. that maintains a stable internal environment despite the changes present in the . Heres the answer!. PLEASE HELP ME I WILL GIVE 20 POINTS!!!! Fill in the words that complete the statement. Jan 04, 2022 · An ecosystem maintains a biological equilibrium between the different components and is referred as a homeostasis. Ernest, in Encyclopedia of Ecology, 2008Homeostasis is the ability of ecological systems to maintain stable system properties despite perturbations. Examples of homeostasis include the regulation of temperature and the balance between acidity and alkalinity (pH). It is dynamic because it is constantly. Maintaining a stable internal environment requires constant monitoring and adjustments as conditions change. Homeostasis is best defined as. Arguably one of the most important aspects of maintaining homeostasis in the human body is related to diet. Homeostasis is the state of maintaining a stable. ” 6. From a homeostasis perspective, the brain, liver, pancreas and intestines all work in concert to keep just the right balance of hormones and neuropeptides to keep blood glucose in check. Homeostasis is a state of Equilibrium where the body maintains a stable internal environment despite external changes. - A control centre, in most cases it is the brain, that regulates the response. It refers to how a person under conflicting stresses and motivations can maintain a stable psychological condition. Feb 02, 2022 · Homeostasis is a stable set of internal conditions that living things maintain despite a changing environment. The presence of high concentrations of solutes in the cells allows animals such as frogs to hibernate at temperatures below freezing and still survive. M2: Discuss the probable homeostatic responses to changes in the internal environment during exercise D2: Evaluate the importance of homeostasis in maintaining the healthy functioning of the body Homeostasis is the process the body takes to keep the body in balance and ensures that there is a stable environment in which cells can. student expectation (se) 10a - describe the interactions that occur among systems that. The American physiologist Walter Cannon used the term Homeostasis to describe the body’s ability to maintain a constant stable internal environment despite the changes to the external surrounding1,2. [1] 'Homeo,' Latinized from the Greek word 'homio,' means 'similar to,' and when combined with the Greek word 'stasis,' meaning 'standing still' gives us the term that is a cornerstone of physiology. Homeostasis is the state of steady internal conditions maintained by living organisms. (A) An ON state exists when cell numbers converge to the same steady-state concentration starting from a range of different initial conditions. . definition of homeostasis is the ability or tendency to maintain internal stability in an organism to compensate for environmental changes. Homeostasis: The process by which a stable internal environment is maintained despite changes in the external environment. Homeostasis Introduction Homeostasis is the ability to maintain a stable internal state that persists irrespective of the outside world. In this lab the participant was to execute an exercise to determine if homeostasis would maintain an stable heart beat and breathing rate. Changes in environmental conditions can have important implications for the ability of. Several different physiological effectors are involved in thermogenesis and heat loss mechanisms to maintain. Essay Sample Check Writing Quality. One way that a cell maintains homeostasis is by controlling the movement of substances across the cell membrane. Homeostasis refers to the body's need to reach and maintain a certain state of equilibrium. Homeostasis attempts to maintain your system in a normal range. Homeostasis is the state of maintaining a stable _____environment despite changing _____. Homeostasis refers to an organism’s ability to regulate various physiological processes to keep internal states steady and balanced. Homeostasis refers to the organism's need to maintain a stable internal environment despite fluctuating external environment. Homeostasis is the ability to maintain a relatively stable internal state that persists despite changes in the world outside (Lanese. (d) Changing the external environment to meet the body’s. The chemical signals such as hormones neurotransmitters or cytokines serve as molecules that aid in sending signals to the internal organs or tissues of the body. Obviously u don't want constantly fluctuations in vital things like BP, internal temperature. The literal translation of homeostasis is "unchanging"; however, the term does not actually mean a static, or unchanging state. Homeostasis is the maintenance of stable internal conditions in a changing environment. Maintaining stable internal conditions despite continuously changing outside world ; HOMEOSTASIS BALANCE ; Variable factor or event being regulated/balanced ; 3 Examples. action throughout the body, as well as all cell functions. Homeostasis is any self-regulating process by which an organism tends to maintain stability while adjusting to conditions that are best for its survival. The phosphotransferase system (PTS) is involved. In this lab the participant was to execute an exercise to determine if homeostasis would maintain an stable heart beat and breathing rate. If homeostasis is successful, life continues; if unsuccessful, disaster or death ensues. These include the carrying capacity of the environment and the capacity for recycling of the waste. Maintaining a stable internal environment requires constant monitoring and adjustments as conditions change. student expectation (se) 10a - describe the interactions that occur among systems that. It is an important feature of living things since maintaining a stable internal environment requires constant adjustments as conditions change inside and outside the. Our body has a normal “set point” for its temperature, which varies slightly from person to person. Since this state is stable over time, homeostasis should be a time-independent state, and, according to Bertalanffy, a state independent from initial conditions. The homeostasis is responsible for the optimal functioning of the cells. Homeostasis is an important characteristic of living things. Typically, we understand that our body's ability to regulate temperature is very important. Download presentation. All living organisms, from plants to puppies to people, must regulate their internal environment to process energy and ultimately survive. this may include heat or blood glucose levels. The body maintains homeostasis by controlling a host of variables ranging from body. that can respond to a stimulus from a nerve Homeostatic Process The human organism consists of trillions of cells working together for the maintenance of the entire organism. More specifically, homeostasis is the body’s tendency to monitor and maintain internal states, such as temperature and blood sugar, at fairly constant and stable levels. It helps to regulate the body’s internal environment and maintain its normal state. Homeostasis is a healthy state that is maintained by the constant adjustment of biochemical and physiological pathways. [6] Allostasis considers the normal daily variations that exist in the internal system. Yet, despite these continuous changes, the body is able to keep its inner environment stable. The role of environmental factors in achieving homeostasis depends on the nature of the disorder. Homeostasis is the maintenance of relatively stable conditions Ensures the body’s internal environment remains steady despite changes both inside and outside the body. One way that a cell maintains homeostasis is by controlling the movement of substances across the cell membrane. Jan 04, 2022 · An ecosystem maintains a biological equilibrium between the different components and is referred as a homeostasis. All thermoregulation mechanisms are designed to return your body to homeostasis. How neuronal circuits maintain stable activity despite continuous environmental changes is one of the most intriguing questions in neuroscience. With negative feedback, the output reduces the original effect of the stimulus. Homeostasis is an important characteristic of living things. Homeostasis is a self-regulating process of equilibrium where the internal conditions of an environment are kept constant to maintain its normal functions. There are two types of biological feedback: positive and negative. Homeostasis is the steady state of internal conditions maintained by an organism despite a changing environment. HYPOTHALAMUS • The hypothalamus is the part of the brain that controls many body functions. Gradually, according to set point theory, the normal body set point keeps adjusting upward. Blood glucose, known more casually as blood sugar, is critically important to body function and overall health. HM is a science that studies the maintenance of the body’s homeostasis. , amount of sugar, and amount of water are some conditions that need to be right in the body for cells to work properly. This happens through a process called osmosis. It is the maintenance of a constant internal environment despite changes in internal and external conditions. , amount of sugar, and amount of water are some conditions that need to be right in the body for cells to work properly. Homeostasis is best described by warm-blooded animals. :) Find Biology textbook solutions? Class 12 Class 11 Class 10 Class 9. The body s ability to adjust to changes and maintain homeostasis directly impacts the state of health of that organism. - with increasing complexity it is essential that basic functions for life are allowed to proceed as smoothly and as undisturbed as possible even in the face of ever-changing environment. homeostasis the process of maintaining a constant internal environment despite changing external conditions Section 7 -3 Figure 7 -15 The Structure of the Cell Membrane Outside of cell Proteins Carbohydrate chains Cell membrane Inside of cell (cytoplasm) Go to Section: Protein channel Lipid bilayer. For example, an organism needs to regulate body temperature through the thermoregulation process. Homeostasis is actually the process of maintaining a stable internal environment despite changes in the external environment. Homeostasis is the ability of ecological systems to maintain stable system properties despite perturbations. Mar 31, 2022 · In biology, the term homeostasis refers to the ability of the body to maintain a stable internal environment despite changes in external conditions. In a nutshell, the internal variables of a homeostatic biological system are robustly regulated to remain within a prescribed operating range even in the presence of external perturbations. Which of the following is a definition of homeostasis? a process whereby the body maintains its internal environment within a narrow range of conditions necessary for optimal cell functioning. Homeostasis typically involves negative feedback loops that counteract changes of various properties from their target values, known as set points. There are two types of biological feedback: positive and negative. • Process by which an organism maintains a constant internal environment despite changing external conditions. Pressure by which the blood is pumped around the body is controlled by a homeostatic mechanism. A positive feedback mechanism is the exact opposite of a negative feedback mechanism. aka founders day 2023
The endocrine system provides an essential mechanism called homeostasis that integrates body activities and at the same time ensures that the composition of the body fluids bathing the constituent cells. . Homeostasis is the state of maintaining a stable environment despite changing conditions
Mar 22, 2022 · Homeostasis is the condition in which the body maintains a state of equilibrium ( a stable internal environment) as it deals with external changes. The term "homeostasis" was proposed by the American physiologist W. Addiction, whether to drugs or to alcohol, disrupts homeostasis and interferes with the body's ability to adapt to change. Why it's important for organisms to maintain homeostasis is to have a good body temperature because being too cool or hot can lead to health complications. The maintenance of the system within a cell is called homeostatic regulation. Homeostasis is the state of maintaining a stable _____environment despite changing _____. Homeostasis is the maintenance of stable internal conditions in a changing environment. The ability or tendency of organisms and cells to maintain stable internal conditions is called. Homeostasis and Cardiovascular System. Sometimes, however, the mechanisms fail. Homeostasis is the maintaining of a balanced condition in the body despite changing external conditions or demands on the body. Homeostasis is the ability to maintain a relatively stable internal state that persists despite changes in the world outside. Homeostasis is the process through which organisms regulate biological functions like heart rate, blood pressure, and temperature. It is the optimal internal state at which your body operates best. Endothermic is where a living. Which of the following best describes homeostasis? the state of maintaining a stable internal environment despite changing external conditions the state of maintaining a stable internal environment as a result of the body producing electrical impulses the state of maintaining a stable internal environment as a result of the body producing chemical signals the state of maintaining a stable. Homeostasis is any self-regulating process by which an organism tends to maintain stability while adjusting to conditions that are best for its survival. • Process by which an organism maintains a constant internal environment despite changing external conditions. Homeostasis is the ability to maintain a relatively stable internal state that persists despite changes in the world outside. Maintaining homeostasis requires that the body continuously monitors its internal conditions. homeostasis, any self-regulating process by which biological systems tend to maintain stability while adjusting to conditions that are optimal for survival. The capability of the body /a cell is to look for and uphold the state of stability inside its internal environment while it. despite the changing external environment. It does not necessarily suggest being stationary or motionless but. ” These “right” conditions are maintained by the body through , the state of maintaining a stable internal environment despite changing external conditions. These changes might be in the level of glucose or calcium in blood or in external temperatures. Notably, pH homeostasis in the calcifying vesicle and changing carbon supply are consistent with the lack of differences in growth rates across seawater treatments, as suggested by the lack of. All living organisms, from plants to puppies to people, must regulate their internal environment to process energy and ultimately survive. Homeostasis is the ability of the body to maintain a stable internal environment despite a changing external environment. This includes maintaining body temperature and fluid. ) the idea. There are two types of biological feedback: positive and negative. In order to maintain this, the body controls temperature. By maintaining a relatively stable internal environment. Homeostasis is the ability of the body to maintain a stable internal environment despite a changing external environment. It refers to the regulation of conditions in the body such as temperature, water content and carbon dioxide levels. Plants absorb water from the soil and use it to maintain homeostasis. Mar 22, 2022 · Homeostasis is the condition in which the body maintains a state of equilibrium ( a stable internal environment) as it deals with external changes. The term was first coined by a physiologist named Walter Cannon in 1926. Homeostasis is an important characteristic of living things. This includes maintaining body temperature and fluid. Homeostasis is the ability to maintain a relatively stable internal state that persists despite changes in the world outside. is the state of maintaining a stable internal environment despite changing external conditions. More specifically, homeostasis is the body’s tendency to monitor and maintain internal states, such as temperature and blood sugar, at fairly constant and stable levels. The importance of maintaining a stable core temperature and stable blood pH in. It means maintaining relatively constant internal conditions. Individual cells, as well as organisms, must maintain homeostasis in order to live. 5d,h,l) compared to wild. That is, the regulation of temperature! Homeostasis comprise of two stages: 1. Simply put, homeostasis is a self-regulating process through which organisms remain stable and constantly adapt to the changing external environment, thus leading to better survival. P5: Explain the concept of homeostasis. Homeostasis is an important characteristic of living things. The chemical signals such as hormones neurotransmitters or cytokines serve as molecules that aid in sending signals to the internal organs or tissues of the body. This is the condition of optimal functioning for the organism and includes many variables, such as body temperature and fluid balance, being kept within certain pre-set limits (homeostatic range). Homeostasis - Homeostasis Homeostasis = maintaining stable internal conditions Dynamic state of equilibrium means. These changes might be in the level of glucose or calcium in blood or in external temperatures. These conditions may, however, change from one moment to the next. Many homeostatic mechanisms such as these work continuously to maintain stable conditions in the human body. Homeostasis is a term coined to describe the physical and chemical parameters that an organism must maintain to allow proper functioning of its component cells, . All living organisms, from plants to puppies to people, must regulate their internal environment to process energy and ultimately survive. It is an organism’s ability to keep a constant internal environment. One of the main functions of mitochondria is to take high-energy molecules—such as sugars and amino acids—and convert them into a form of energy, called adenosine triphosphate ( ATP ), which the cell can use. HYPOTHALAMUS • The hypothalamus is the part of the brain that controls many body functions. homeostasis is the state of maintaining a stable environment despite changing conditions. Under certain. environment despite changing. Homeostasis typically involves negative feedback loops that counteract. 8/5 (8 votes). 17 dic 2003. Body Organization and Homeostasis - Match up. Homeostasis is the ability to maintain a stable internal state despite external changes in the world. Homeostasis is the maintaining of a balanced condition in the body despite changing external conditions or demands on the body. Dissolves many things (Universal solvent) Key to biological processes Maintains homeostasis. a process in which the external environment has no influence on the internal environment. More specifically, homeostasis is the body’s tendency to monitor and maintain internal states, such as temperature and blood sugar, at fairly constant and stable levels. The UPS plays a critical role in cellular homeostasis and protein quality control, and also contributes to the regulatory degradation of essential intracellular proteins involved in cell cycle progression, cell division, transcription and cell signaling ( Goldberg, 2007, Murata et al. Regulators maintain a nearly constant internal environment, despite external conditions 2. Proteins in the cell membrane include cell-surface markers receptor proteins enzymes. What is homeostasis? Maintaining constant and stable internal conditions despite changes in the outside environment. The literal translation of homeostasis is "unchanging"; however, the term does not actually mean a static, or unchanging state. In this process, a biological system can maintain its stability and also help to increase the efficiency of any physiological process. a group of related organs with a common function. All living things from. More specifically, homeostasis is the body's tendency to monitor and maintain internal states, such as temperature and blood sugar, at fairly constant and stable levels. Homeostasis is the state of maintaining a stable _____environment despite changing _____. Homeostasis refers to the ability of an organism or environment to maintain stability despite changes. Homeostasis is the balance inside your body. Which of the following best describes homeostasis? the state of maintaining a stable internal environment despite changing external conditions the state of maintaining a stable internal environment as a result of the body producing electrical impulses the state of maintaining a stable internal environment as a result of the body producing chemical signals the state of maintaining a stable. They provide the controls needed to keep the effects of hormones and hormone chain reactions from spiraling out of control. This is the condition of optimal functioning for the organism and includes many variables, such as body temperature and fluid balance, being kept within certain pre-set limits. The body responds to changes in the internal environment in a number of ways. First, cells need to obtain energy and excrete waste products. Ernest, in Encyclopedia of Ecology, 2008Homeostasis is the ability of ecological systems to maintain stable system properties despite perturbations. If the body becomes deficient (or alternatively, overabundant) in any. All living organisms, from plants to puppies to people, must regulate their internal environment to process energy and ultimately survive. Homeostasis is the ability to maintain a relatively stable internal state that persists despite changes in the world. This ability of the body to maintain a stable internal environment despite a changing environment is called home-ostasis. It is the optimal internal state at which your body operates best. Homeostasis keep the internal conditions. Homeostasis is the tendency of biological systems to maintain relatively. Homeostasis is the ability to maintain a relatively stable internal state that persists despite changes in the world outside. 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