PSYB64H3 Chapter Notes - Chapter 9: Liposuction, Xerostomia, Anterior Grey Column

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22 Dec 2017
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Internal systems control body temp, fluid intake and weight. In humans, env factors play imp role in disrupting/overriding the finely tuned regulatory systems. Temp regulation involves all major features of a homeostatic system: precise defined set point, mechanisms for detecting deviations away from the set point internal and beh elements designed to regain the set point. Sa: animals in cold climates conserve heart by having compact, stocky bodies and short legs, tails and ears. Blood vessels normally constrict in response to cold. Inc release of thyroid hormone to inc metabolic rate. When deviations from set points occur, the process of motivation activates and directs behavior designed to remedy the situation. Endotherms can maintain body temperature through internal activity, whereas ectotherms rely on external factors. The hypothalamus, brainstem, and spinal cord produce a hierarchy of responses to changes in temperature, with the hypothalamus providing the most precise level of control.

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