Which of these occurs when air leaves the lungs?
A. The diaphragm relaxes.
B. Thoracic pressure decreases.
C. The diaphragm flattens, enlarging the thoracic cavity.
D. The intercostal muscles raise the ribs.
E. Air pressure in the lungs becomes lower than atmospheric pressure.
A. The diaphragm relaxes.
During expiration, the diaphragm relaxes, decreasing the amount of space in the thoracic cavity and raising the air pressure in the lungs to above atmospheric pressure.
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