Chapter_42b - Biology, 7e (Campbell) Chapter 42b: Gas...

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Biology, 7e (Campbell) Chapter 42b: Gas Exchange 1) Which of the following features do all gas exchange systems have in common? A) The exchange surfaces are moist. B) They are enclosed within ribs. C) They are maintained at a constant temperature. D) They are exposed to air. E) They are found only in animals. 2) Why is gas exchange more difficult for aquatic animals with gills than for terrestrial animals with lungs? A) Water is denser than air and therefore harder to move. B) Water contains much less O 2 than air per unit volume. C) Gills have less surface area than lungs. D) Only A and B are correct. E) A, B, and C are correct. 3) Which of the following is an example of countercurrent exchange? A) the flow of water across the gills of a fish and that of blood within those gills B) the flow of blood in the dorsal vessel of an insect and that of air within its tracheae C) the flow of air within the primary bronchi of a human and that of blood within the pulmonary veins D) the flow of water across the skin of a frog and that of blood within the ventricle of its heart E) the flow of fluid out of the arterial end of a capillary and that of fluid back into the venous end of the same capillary 4) Countercurrent exchange in the fish gill helps to maximize A) endocytosis. B) blood pressure. C) diffusion. D) active transport. E) osmosis. 5) Which one of the following statements about gills operating in water is false ? A) Water can support the delicate gill features.
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Chapter_42b - Biology, 7e (Campbell) Chapter 42b: Gas...

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