What happens when the diaphragm contracts?
A. The size of the thoracic cavity decreases and air flows into the lungs.
B. The size of the thoracic cavity increases and air flows out of the lungs.
C. The size of the thoracic cavity increases and air pressure in the thorax increases.
D. The size of the thoracic cavity decreases and air pressure in the thorax drops.
E. The size of the thoracic cavity increases and air flows into the lungs.
Answer: E
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