Lecture 19, Ch. 44

Lecture 19, Ch. 44 - Lecture #19 Date_ Chapter 44 ~...

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Lecture #19 Date________ Chapter 44 ~ Regulating the Internal Environment
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Homeostasis : regulation of internal environment Thermoregulation internal temperature Osmoregulation solute and water balance Excretion nitrogen containing waste
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Regulation of body temperature Thermoregulation 4 physical processes : Conduction ~transfer of heat between molecules of body and environment Convection ~transfer of heat as water/air move across body surface Radiation ~transfer of heat produced by organisms Evaporation ~loss of heat from liquid to gas Sources of body heat : Ectothermic: determined by environment Endothermic: high metabolic rate generates high body heat
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Regulation during environmental extremes Torpor ~ low activity; decrease in metabolic rate 1- Hibernation long term or winter torpor (winter cold and food scarcity); bears, squirrels 2- Estivation short term or summer torpor (high temperatures and water scarcity); fish, amphibians, reptiles Both often triggered by length of daylight
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Water balance and waste disposal Osmoregulation:
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This note was uploaded on 10/31/2011 for the course BIO 102 taught by Professor Robinson during the Spring '09 term at UPenn.

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Lecture 19, Ch. 44 - Lecture #19 Date_ Chapter 44 ~...

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