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The external environment and making demands on your body do not always provide the ideal conditions for life
Your body must adjust these variations to maintain a stable internal environment
Homeostasis is a term used to describes the body’s attempt to adjust to a fluctuation external environment
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Homeostasis is maintained through constant monitoring and feedback about body conditions
Homeostatic control systems require:
-a monitor; receptors signal the coordination centre when internal environment levels move away from normal limits
-a coordination centre; relay information to the appropriate regulator
-a regulator; helps to restore the normal balance
Negative Feedback Systems:
-make adjustments to bring the body back within an acceptable range
-ex. A household thermostat
Positive Feedback Systems:
-move the controlled variable even further away from a steady state
-ex. The human birth process