Which of the following statements concerning thoracic volume is true?
A. Pressure is directly proportional to volume.
B. In expiration, the thoracic volume increases.
C. As alveolar volume increases, alveolar pressure (Palv) decreases.
D. Constriction of bronchioles assists breathing.
E. As thoracic volume increases, alveolar pressure (Palv) increases.
Answer: C
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