BIO172W08Lec30CT - Lecture 30Gas Exchange/Circulation:...

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Lecture 30- Gas Exchange/Circulation: Animals March 28, 2008 Today’s Outline 1. Gas Exchange - Surface Area/Volume - Ventilation, Circulation, Respiration - Partial pressure of gases - Fick’s Law of Diffusion - 2. Circulatory System - Oxygen & Bohr Effect - CO 2 & Buffering - Heart Announcements Revised reading: Ch.41 (pp.941-944); Ch.44 (pp.999-1007, 1009-1012, 1017) Biology 172
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Review Cellular Respiration out in
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Surface Area/Volume Relationship Why are size and shape important factors in metabolic, physiological, and developmental functions and environmental adaptations?
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Tissue adaptations to increase surface area for diffusion Helps to counteract the problem of the reduction in surface area/volume ratio with increased size
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Steps in Gas Exchange 1. Move air or water from external environment over specialized surface: exchange O 2 and CO 2 2. Transport dissolved gases around body 3. Exchange O 2 and CO 2 with cells; cellular respiration in mitochondria
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Atmospheric Gases and Partial Pressures Gases move by diffusion Gases move down a gradient of partial pressure Partial pressure (P) of a gas reflects the number of molecules present and their thermodynamic energy Pressure is a measure of force (mm Hg)
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This note was uploaded on 12/06/2009 for the course BIO 172 taught by Professor Clark during the Winter '08 term at University of Michigan.

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BIO172W08Lec30CT - Lecture 30Gas Exchange/Circulation:...

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