Which of the following factors must be overcome by the pressure developed by the respiratory muscles during spontaneous breathing? I. elastic recoil of the respiratory system II. the pressure generated to encounter airway resistance III. respiratory system inertia IV. esophageal pressure
A. II, IV only
B. I, II, III only
C. I, III, IV only
D. II, III, IV only
?ANS: B
A. Incorrect response: See explanation B.
B. Correct response: During spontaneous breathing, the respiratory muscles must overcome (1) the respiratory system's elastic recoil, (2) the pressure developed in the system to overcome airway resistance, and (3) the inertia of the respiratory system.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.
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