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SECTION VI. RESPIRATORY PHYSIOLOGY

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

A. 0.1

B. 0.5

C. 5

D. 50

E. 100

The forced vital capacity is

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

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

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

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

The tidal volume is

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

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

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

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

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

A. Active transport

B. Filtration

C. Secondary active transport

D. Facilitated diffusion

E. Passive diffusion

Airway resistance

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

B. does not affect the work of breathing.

C. is increased in paraplegic patients.

D. is increased following bronchial smooth muscle contraction.

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

Surfactant lining the alveoli

A. helps prevent alveolar collapse.

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

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