HTHSCI 1H06 Lecture Notes - Lecture 16: Hypothalamus, Ovulation, Homeostasis
29 Apr 2016
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Document Summary
Homeostasis and life: animals, humans included, maintain dynamic balance (homeostasis) in just about every aspect of life, even risky behaviour seems to be under some sort of homeostatic regulation. The regulation of blood glucose by negative feedback. Effectors: body cells and liver take up glucose. Homeostasis and body temperature: temperature remains between 36 and 40 c. Homeostasis: above 41 c your body loses its ability to cool down (hyperthermia, below 32 c your body loses its ability to warm up (hypothermia, large deviations from the set point make it impossible to maintain homeostasis. Detectors: skin and hypothalamic temperature sensors detect increase and relay message to hypothalamus. Control centre: hypothalamus receives message and stimulates effectors. Effectors: blood vessels in the skin dilate and sweat glands are activated. Increased evaporation and conduction convection decreases body temperature. The positive feedback mechanism: another way to maintain homeostasis when a distance event will facilitate the return to homeostasis, requires:
