CAS BI 315 Chapter Notes - Chapter 1.5-1.9; 2.4; 3.8-3.5: Reflex Arc, Negative Feedback, Positive Feedback
19 Jan 2018
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Document Summary
Homeostatic control systems mechanisms that maintain and integrate the actions of organs. Balance of inputs/outputs (magnitudes don"t matter per say, mostly balance) Cannot remain constant range of acceptable values. Not every variable can be maintained in response to change (hierarchy) Steady state a system in which a variable is not changing but energy must constantly be input. Different from equilibrium where no energy is required. Set point certain variable level/value for steady state. Homeostatic responses help to maintain steady state. Negative feedback increase/decrease in variable change in opposite direction of og change. Ex: high atp inhibits atp production; low atp removes - feedback atp production. Positive feedback variable further promotes its own response (explosion) Set points can be reset/changed in certain situations. Feedforward regulation body anticipates change and reacts accordingly. Ex: skin gets cold neurons relay info body reacts to conserve heat before entire organs get cold. Reflexes specific, involuntary built-in response to particular stimulus.
