Gas Exchange.pdf - Gas Exchange Ch 22 Outline • Forms of...

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Gas Exchange Ch. 22
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Outline Forms of Respiration Control of Ventilation Transport of gases
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Gas Exchange We require O 2 & give up CO 2 Cellular respiration in mitochondria! Breathing ( ventilation ) Inhale/exhale Transport Gases carried in bloodstream Exchange Cells take O 2 & release CO 2 Fig. 22.1, pg. 458
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Make up of Air Concentration of compound Atmospheric Air Expired Air Nitrogen 79% 79% Oxygen 21% 14-16% Carbon Dioxide 0.04% 4% Water vapor 0.5% 6% Expired air contains less oxygen, more CO 2 and water vapor. pg. 456
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Variations in Respiration Skin Absorb gases through skin Gills Water flows over respiratory extensions Tracheal system Internal tubes exchange gases directly with body cells Lungs Gases carried between lungs & body cells Fig. 22.2, pg. 459
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Gills Gills Respiratory surface on filament extensions Water flows in mouth, out over gills Countercurrent exchange Water & blood flow in opposite directions Maintains gradient to absorb maximum O 2 Fig. 22.3, pg. 460
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Countercurrent Exchange System pg. 468
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