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Lecture

biol 1020

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School
University of Guelph
Department
Biology
Course
BIOL 1020
Professor
Andreas Heyland
Semester
Winter

Description
Lecture 28 Thermoregulation and Osmoregulation More homeostatic systems … • Examples of homeostasis include – ________________________—the maintenance of internal temperature within narrow limits, – ________________________—the control of the gain and loss of water and solutes, and – ________________________—the disposal of nitrogen-containing wastes. © 2012 Pearson Education, Inc. • ___________ animals – gain most of their heat from ___________ sources and – include many _____, most ____________, __________, and most _____________. • ___________ animals – derive body heat mainly from their _______________and – include ______, __________, a few _____________, and many ___________. • __________________: Body temperature is determined primarily by external sources • __________________: internal temperature varies considerably NOT ______________________ • __________________: Body temperature is determined primarily by internal sources • __________________: internal temperature does not vary much NOT ______________________ Figure 25.2 Heat is gained or lost in four ways • Heat exchange with the environment may occur by – conduction—the transfer of heat by ____________, – convection—the transfer of heat by movement of air or liquid __________________, – radiation—the emission of __________________ waves, or – evaporation—the loss of heat from the surface of a liquid that is losing some of its _______________ ___________________. © 2012 Pearson Education, Inc. Thermoregulation involves adaptations that balance heat gain and loss • Increased metabolic heat production occurs when – _____________________ boost the metabolic rate in birds and mammals, – birds and mammals _____________, – organisms increase their _________________, and – honeybees ___________________________. © 2012 Pearson Education, Inc. Adaptations to low temperature _________________: Temperatures as low as minus _____________________ • _______________________ • Hair between ___________ of their feet Seals: • ________________ – fat layer • Several inches thick • Acts as ____________________. • Penguins – __________, – __________, and – _____________. Thermoregulation involves adaptations that balance heat gain and loss • Circulatory adaptations include – increased or decreased blood flow to skin and – ____________________________________, with warm and cold blood flowing in opposite directions. © 2012 Pearson Education, Inc. Figure 25.3_2 35 33C 30 27 20 18 10 9 Thermoregulation involves adaptations that balance heat gain and loss • _______________ _______________ may
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