Although the alveoli become enlarged, elderly people have difficulty expelling used air from the lungs because of:
A. sustained vasoconstriction of the alveolar-capillary vessels.
B. decreased alveolar tension secondary to increased surfactant.
C. frequent consolidation of infectious material in the alveoli.
D. decreased alveolar elasticity secondary to decreased surfactant.
Answer: D. decreased alveolar elasticity secondary to decreased surfactant.
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