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Homeostasis

homeostasis

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Homeostasis Maintaining internal balance whoaa! Mechanisms of homeostasis moderate changes in the internal environment Any homeostatic control system has 3 functional components: a receptor, a control center and an effector Regulators & Conformers regulators try to maintain the parameter at a constant level even with varying environmental variations. (ex: ectothermic animals? almost all other organisms?exhibit wide body temperature variation. (ex: endothermic mammals and birds maintain a constant body temperature) conformers allow the environment to determine the parameter. Negative feedback A change in an internal variable will stimulate a response that counteracts the initial fluctuation until the system goes back to its normal state Negative feedback Negative feedback

Homeostasis+ Endocrine system

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Hormones & homeostasis Its all a question of balance Homeostasis ? the maintenance of internal conditions in the body within narrow limits There are many variables that the body must maintain within certain limits for it to function properly E.g. Blood pH; CO2 concentration; Blood glucose concentration; Body Temperature; Water Balance Our bodies undergo a series of physiological changes if these variables move beyond a certain 'normal' range The nervous & endocrine systems are in charge of maintaining homeostasis Role of the Endocrine System The endocrine system works together with the nervous system to regulate physiology All of the hormone secreting organs in an animal make up the endocrine system

Biology Review (Chapters 1 - 4)

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Chapter 1 Common Characteristics of Life  composed of cells  highly organized  exchanges energy with the environment  responds to stimuli  reproduces itself  evolves over time  adapts to environment  maintains homeostasis 7 characteristics common to life 1. Cells and organization: organisms maintain an internal order – simplest is the cell 2. Energy use and metabolism: to maintain internal order, energy is needed. Energy is utilized in chemical reactions collectively known as metabolism 3. Response to environmental changes: organisms react to environmental changes to increase chances of survival 4. Regulation and homeostasis: organisms regulate cells and body to maintain homeostasis – relatively stable internal conditions
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