Ch48MCAT

Ch48MCAT - 48 Gas Exchange in Animals Multiple Choice 1....

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48 Gas Exchange in Animals Multiple Choice 1. Breathing provides the body with oxygen required to support the energy metabolism of all cells. Breathing also eliminates _______, one of the waste products of cell metabolism. a. CO 2 b. CO c. carbon tetrachloride d. calcium carbonate e. carbonic acid Answer: a 5. Gas exchange in animals always involves a. cellular respiration. b. breathing movements. c. neural control of exchange. d. diffusion across membranes. e. active transport of gases. Answer: d 14. Which of the following structures is the site of gas exchange in the lungs? a. Alveoli b. Bronchi c. Bronchioles d. Trachea e. Both a and b Answer: a 15. Which factor maximizes the rate of gas exchange in mammals? a. Exceedingly high partial pressures of O 2 in the blood b. The larynx (voice box) opening into the trachea c. Enormous surface area for gas exchange d. The small increase in size during inhalation e. Production of mucus and surfactants Answer: c 16. Surfactant produced by cells lining the alveoli serves to a. increase surface tension. b. increase stretching of the alveolar walls. c. assist muscular movements of breathing. d. reduce cohesion of surface molecules. e. reduce ciliary movement.
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Answer: d 17. One effect of cigarette smoking on the lungs is to a. remove mucus from the airways. b. immobilize cilia lining the airways. c. speed air flow through the airways.
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Ch48MCAT - 48 Gas Exchange in Animals Multiple Choice 1....

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