Air rushes into the lungs of humans during inhalation because
A. pulmonary muscles contract and pull on the outer surface of the lungs.
B. smooth muscle lining the trachea, bronchi, and bronchioles contracts and causes their volume to increase.
C. the diaphragm contracts and pushes upward on the chest cavity.
D. pressure in the alveoli increases.
E. the volume of the thoracic cavity increases.
Answer: E
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