All of the following are effects of aging on the respiratory system except which one?
A. Obstructive sleep apnea may develop in the elderly as the pharyngeal muscles intermittently relax and block the airway during sleep.
B. With age, less mucus accumulates in the respiratory tract because the ciliated escalator becomes more efficient.
C. Thoracic wall compliance decreases due to the diminished ability to expand the chest.
D. Some of the alveoli walls may breakdown, which reduces the area of the respiratory membrane.
Answer: B
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