Which of these occurs when air leaves the lungs? 

A. Air pressure in the lungs is higher than atmospheric pressure, and the diaphragm relaxes.
B. Thoracic pressure decreases.
C. The diaphragm contracts, enlarging the thoracic cavity.
D. The intercostal muscles raise the ribs.


A. Air pressure in the lungs is higher than atmospheric pressure, and the diaphragm relaxes.

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