Introduction to Psychobiology Day 17

Preoptic area poa monitors body temperature partly by

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Preoptic area (POA) monitors body temperature partly by monitoring its own  temperature o Experimentally manipulate POA temperature Cool – animal shivers Warm – animal pants or sweats o Receives inputs from skin o Other brain areas involved – not just POA Preoptic nucleus Optic nerve Optic chiasm Pituitary Hypothalamus
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Behavioral Mechanisms of Temperature Regulation Cold-blooded animals choose environment to regulate body temperature Mammals also pick environment; but not as dependent o Fever – often body’s defense against illness Prostaglandin produced by white blood cells and produces fever  via preoptic area Fever can be a good thing Prostaglandin is one of the agents that helps fight off  infection o Shiver – increase muscle activity and energy expenditure Summary Thermoregulation – homeostatic mechanism o “set points” have narrow range of temperature variation neural mechanisms of temp. control in preoptic area of warm-blooded animals behavioral regulation best demonstrated in fish & amphibians Fluid Regulation Homeostatic variable
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  • Fall '12
  • DavidHill
  • body temperature, Normal human body temperature, preoptic area

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