8 Respiration 2 Animals

8 Respiration 2 Animals - Respiration I. Gas exchange A....

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Unformatted text preview: Respiration I. Gas exchange A. Cellular versus organismal B. Requirements for organismal gas exchange C. Diffusion of gases in air versus water II. Respiration in animals via specialized organs: A. Gills B. Lungs - structure and ventilation III. Gas transport in blood Respiration via Specialized Organs: Gills fold outward Lungs fold inward WHY?? Figure 42.21: Gills arapodium (functions as gill) a) Marine worm Gills (b) Crayfish (c) Sea star Tube foot Coelom Gills Countercurrent Exchange Enhances Efficiency of Gas Exchange over Gills Fig. 42.22 Anatomy of gills Gill arch ater ow Operculum Gill arch Gill filament organization Blood vessels Oxygen-poor blood Oxygen-rich blood Fluid flow through gill filament Lamella Blood flow through capillaries in lamella Water flow between lamellae Countercurrent exchange P O 2 (mm Hg) in water P O 2 (mm Hg) in blood Net diffu- sion of O 2 from water to blood 150 120 90 60 30 110 80 20 Gill filaments 50 140 Lungs - Respiratory Surfaces Bridged by Circulatory System...
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This note was uploaded on 10/21/2011 for the course BIO 102 taught by Professor Robinson during the Spring '09 term at UPenn.

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8 Respiration 2 Animals - Respiration I. Gas exchange A....

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