Chapter 48 overview

Chapter 48 overview - Chapter 48 – Gas Exchange in...

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Chapter 48 – Gas Exchange in Animals Chapter Overview 1. What are the respiratory gases? How are they exchanged across the respiratory surfaces? diffusion 2. What is barometric pressure? What is the barometric pressure at sea level? Atmospheric pressure 3. What is a partial pressure? What percentage of the atmosphere is oxygen? 20.9% 4. According to Fick’s law what 3 things can be changed to maximize the rate of gas exchange? SA, L, PP 5. Compare water and air as respiratory mediums. Why do air breathers also have to deal with the limits of water? Oxygen diffuses 8000X faster from air than water; Cells bathed in solution 6. Why does a rise in water temperature create a double-bind situation for aquatic animals? 7. What are ventilation and perfusion? 8. Why is the counter current exchange of fish gills more efficient? Always a pressure gradient over full length of exchange surfaces 9. Why are bird lungs the most efficient vertebrate lungs? Explain the pattern of air flow. unidirectional
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Chapter 48 overview - Chapter 48 – Gas Exchange in...

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