What is the MOST common cause of atelectasis?
a. A bronchiole becomes blocked with secre-tions, and distal alveoli collapse.
b. Alveoli distal to the affected bronchiole become overdistended with trapped air, and they rupture.
c. Bronchi within the affected portion of the lung become chronically dilated.
d. Pressure inside the affected portion of the lung has become less than the pressure outside the body.
A
The pleural fluid secreted into the pleural cavity compresses lung tissue and can cause atelectasis if untreated.
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