MCAT Question A Day - 3/16/14
During respiratory ventilation, impulses along the phrenic nerves stimulate the diaphragm, causing it to contract and move downward. When this occurs, which of the following takes place in the thoracic cavity and lungs?
A. Volume increases, pressure increases, and air moves out.
B. Volume decreases, pressure decreases, and air moves out.
C. Volume increases, pressure decreases, and air moves in.
D. Volume decreases, pressure increases, and air moves in.
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