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iphy 3430 lecture 3

iphy 3430 lecture 3 - If heat prod> heat loss Tb rises If...

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Regulation of Body Temperature Heat vs. temperature
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Physical Principles 1. Heat always flows from area of greater heat energy to lower heat energy. 2. The rate of heat flow is dependent on the temperature differential between the warmer area and the cooler area (larger T causes faster rate of heat flow)
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All living things produce heat but.. Depending on the rate of heat production, heat production may or may not affect body temperature.
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Plants and animals produce heat at a low rate (poikilothermic or ectothermic)--7-10x lower rate than birds or mammals (homeothermic or endothermic) at same body mass and body temperature Environmental temp log Metabolic rate Environmental temp Tb
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Birds and mammals (homeothermic, endothermic) Tb Air temperature Air temperature 78 72 Met. rate 98F If heat prod = heat loss, Tb constant
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Unformatted text preview: If heat prod > heat loss, Tb rises If heat prod < heat loss, Tb drops Thermoneutral zone Sweating Shivering Piloerection Vasodilation Vasoconstriction Insulation decreases the need for increased heat production in the cold Met. rate Air temperature 72 Temperature Regulation System 1. Morphology a. sensors--located in skin, brain, spinal cord, liver, muscle Firing rate Temperature of skin, or brain, etc. cold warm hot 2. Integrator (hypothalamus) cold warm hot output Hypothalamus compares input from sensors with a “setpoint”, and takes preventative action BEFORE body temp. changes 3. Output 1. Motor -shivering 2. Sympathetic nervous system (one branch of the autonomic nervous system) a. vasomotor responses b. piloerection c. sweating...
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