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HMB200H1 (140)
Lecture 13

Lecture 13

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Department
Human Biology
Course
HMB200H1
Professor
John Yeomans
Semester
Winter

Description
HMB200 L13; Feb. 28, 2012 Hypothalamus & Homeostasis (continued) Endotherms  Produce own body heat; warm-blooded  5X bigger brains than reptiles due to internal body heat  Birds & mammals control body temperature near 37ºC.  Advantages: Constant physiology, better brain fn, bigger brains, adaptation to extreme envts. o Not envt’al temp dependent so brain & body doesn’t slow down, so faster & better brain fn’ing allowing for survival  Costs: More insulation needed (fat, feathers, fur), more energy needed, more internal controls. Temp Control Systems  Temp maintenance – anterior nuclei  Cold-sensitive neurons in anterior hypothal  Sympathetic  Metabolism of brown fat  get warmer  Need recs for temp on skin, throughout body & in hypothal to main body temp  Afferents: receive temp measurements  Neural regions: CPG – central pattern generator??  Effectors: heat regulation  Heat dispersal – posterior nuclei??  Accelerated respiration – ex. dogs  Dilation of cutaneous – pink skin  Parasympathetic  Perspiration - sweat Fluid Regulation  Body made up of ~65% H O, 2or cell chemistry,
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