A respiratory therapist has asked a client to breathe in as deeply as possible during a pulmonary function test. Inspiration is normally the result of which of the following phenomena?
A) Decreased intrapulmonary pressure
B) Increased airway pressure
C) Increased intrapleural pressure
D) Decreased intrathoracic pressure
Ans: D
Feedback:
During inspiration, contraction of the diaphragm and expansion of the chest cavity produce a decrease in intrathoracic pressure, causing air to move into the lungs.
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