1 A) decreased the tidal volume. B) did not change the tidal volume. C) increased the tidal volume. 2 A) across the walls of the airways. B) across the walls of airways and the alveoli. C) across the walls of the alveoli. 3 A) none of the air reached the alveoli; 0 mL. B) the same as the airway volume; about 150 mL. C) the tidal volume – the airway volume; about 225 mL. D) all of the air that was inhaled; about 400 mL. 4 A) The volume of air entering the alveoli increased. B) The volume of air entering the alveoli decreased. C) The volume of air entering the alveoli did not change. 5 A) none of the air reached the alveoli; 0 mL. B) the tidal volume – the airway volume; about 150 mL. C) all of the air that was inhaled; about 300 mL. 6 A) at the base of the lung, below the heart. B) in the center of the lung, in line with the heart. C) at the apex of the lung, above the heart. 7 A) at the base of the lung, below the heart. B) in the center of the lung, in line with the heart. C) at the apex of the lung, above the heart. 8 A) at the base of the lung. B) in the center of the lung. C) at the apex of the lung. D) none of the above. The effect of gravity will be less than in a standing person. 9 A) the surface for gas exchange increases when they lie down. B) the surface for gas exchange does not change when they lie down. C) the surface for gas exchange decreases when they lie down. 10 A) lower than when standing, because the increased surface area allows more efficient gas exchange. B) the same as when standing, because gravity has no effect on breathing. C) greater than when standing, because more oxygen is needed when you are lying down.
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