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SECTION VI. RESPIRATORY PHYSIOLOGY

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On the summit of Mt. Everest, where the barometric pressure is about 250 mm Hg, the partial pressure of O2 in mm Hg is about

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A. 0.1

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B. 0.5

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C. 5

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D. 50

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E. 100

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The forced vital capacity is

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A. the amount of air that normally moves into (or out of) the lung with each respiration.

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B. the amount of air that enters the lung but does not participate in gas exchange.

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C. the amount of air expired after maximal expiratory effort.

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D. the largest amount of gas that can be moved into and out of the lungs in 1 min.

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The tidal volume is

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A. the amount of air that normally moves into (or out of) the lung with each respiration.

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B. the amount of air that enters the lung but does not participate in gas exchange.

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C. the amount of air expired after maximal expiratory effort.

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D. the amount of gas that can be moved into and out of the lungs in 1 min.

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Which of the following is responsible for the movement of O2 from the alveoli into the blood in the pulmonary capillaries?

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A. Active transport

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B. Filtration

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C. Secondary active transport

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D. Facilitated diffusion

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E. Passive diffusion

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Airway resistance

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A. is increased if the lungs are removed and inflated with saline.

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B. does not affect the work of breathing.

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C. is increased in paraplegic patients.

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D. is increased following bronchial smooth muscle contraction.

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E. makes up 80% of the work of breathing.

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Surfactant lining the alveoli

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A. helps prevent alveolar collapse.

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B. is produced in alveolar type I cells and secreted into ...

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