PSY 177 Lecture Notes - Lecture 15: Reward System, Polyphagia, Solitary Tract
31 May 2017
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Document Summary
Homeostasis maintains a consistent internal environment: the example of thermoregulation. Homeostasis is the active process of maintaining a relatively stable, balanced internal environment. Thermoregulation is the active process of closely regulating body temperature around a set value. Endotherms generate most of their own heat through internal processes, ex: mammals. Ectotherms get most of their heat from the environment. Some of the output of a system feeds back to reduce the effect of input signals. Deviation from set point activates a compensatory response. Set zone = small range of desired values. Set point = metabolism = decreases when calories decrease. After 7 days on a diet of 3500 kilocalories (kcal) per day, the intake of six obese participants was restricted to a measly 450 kcal/day a drop of. However, basal metabolism also declined by 15%, so after 3 weeks, body weight had declined by only 6%. (after bray, 1969. ) Glucose is the principal sugar used for energy.
