5. Respiration

5. Respiration - Biology107Fall07 Respiration 1 Respiration...

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Biology 107 – Fall ‘07  Respiration 1 Respiration Reading: Chapter 42 2 Gas exchange: Pulmonary  Lungs  (CO 2 )–(O 2 )  Blood The  respiratory medium  (source of oxygen) is air for terrestrial animals and water for aquatic animals Respiratory surfaces  have surface area specializations in complex/large animals Large surface area (lungs: alveoli; gills) Thin, moist respiratory surface Why do we need oxygen? (See fig. 42.19) O 2  to burn (oxidize) fuel for energy transfer (ATP) GILLS ARE RESPIRATORY ADAPTATIONS FOR MOST AQUATIC ANIMALS Gills (fig. 42.20) must be very effective to obtain enough oxygen from aquatic respiratory medium * Surface area Ventilation  processes increase flow of respiratory medium (here, water) over respiratory surface  (gills.) Pump H 2 O (with oxygen) over gills Countercurrent exchange  is possible in fish gills due to the arrangement of capillaries, and  maximizes oxygen transfer from water to blood (Fig. 42.21)
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5. Respiration - Biology107Fall07 Respiration 1 Respiration...

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