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Lec6 - Thermal Regulation III - Lecture 6 Thermal...

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Lecture 6 Thermal Regulation III Reading: Chapter 13, pp. 621 – 636, 647 - 656 Lecture outline: I. Endothermy II. Thermoregulatory Mechanisms in Endotherms III. Location of the thermostat
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In the brain! Where in the brain? In the hypthalamus! Hypothalamus acts as a thermostat Peripheral thermosensors in the skin can detect external temperature changes as well. III. Where is the thermostat?
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Hypothalamic Control of Thermoregulatory Mechanisms
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I. ENDOTHERMY What is an endotherm? Maintains a constant body temperature that is usually different from ambient temperature. Only times that body temperature goes outside of tight range is fever and torpor (hibernation).
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Physiological Characteristics of Endotherms Endotherms produce heat physiologically to maintain body temperature; ectotherms do not. Endotherms have insulation that maintains the heat within the body; ectotherm are poorly insulated. Endotherm increases heat production AND decreases conduction!
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Endothermy is expensive! Energy usage is much higher at all temperatures  compared to ectotherms!
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Three questions about physiological differences between endotherms and ectotherms: Q. Would an iguana with a cat’s fur coat warm up to the T b (body temperature) of a cat? Q. If you put a small light near an iguana and increase the wattage, would the iguana have the T b of a cat?
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