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04classactual - Ectotherm : An animal unable to control its...

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Biology 182, 2009 Lecture 4, January 28 1 Temperature homeostasis Fear No More Fear no more the heat o' the sun; Nor the furious winter's rages… William Shakespeare Homeostasi: Maintenance of stable conditions. •Claude Bernard (1838-1878): “Constancy of the internal environment is the condition for free life.” •Walter Cannon (1871-1945): “Homeostasis is the coordinated physiological processes which maintain most of the [constant] states in the organism.”
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Biology 182, 2009 Lecture 4, January 28 2 Control and Integration From Schmidt-Nielsen Temperature and Reaction Rates
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Biology 182, 2009 Lecture 4, January 28 3 Heat Budget Heat Budget
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Biology 182, 2009 Lecture 4, January 28 4 Classifcations oF animals by their temperature regulation Endotherm : An animal that can control its body temperature by expenditure oF metabolic energy
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Unformatted text preview: Ectotherm : An animal unable to control its body temperature by metabolic energy Homeotherm : An animal that maintains a constant temperature Heterotherm : An animal that regulates its body temperature at a constant level at some times but not others. Biology 182, 2009 Lecture 4, January 28 5 Biology 182, 2009 Lecture 4, January 28 6 Core 37C Periphery 5C Countercurrent exchange Core Periphery Thermoregulating ectotherm (partial homeotherm) Biology 182, 2009 Lecture 4, January 28 7 Tuna temperature Water Temperature Biology 182, 2009 Lecture 4, January 28 8 Salmon Mako Why is slow muscle in a Mako deep? Heat exchanger Biology 182, 2009 Lecture 4, January 28 9 Figure 41.13 The Mouse-to-Elephant Curve (Part 1) Figure 41.13 The Mouse-to-Elephant Curve (Part 2)...
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This note was uploaded on 02/08/2009 for the course BIOL 182 taught by Professor Devoto during the Spring '09 term at Wesleyan.

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04classactual - Ectotherm : An animal unable to control its...

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