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Cybernetics

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

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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