Air rushes into the lungs of humans during inhalation because _____
A) the rib muscles and diaphragm contract, increasing the lung volume
B) the volume of the alveoli increases as smooth muscles contract
C) gas flows from a region of lower pressure to a region of higher pressure
D) pulmonary muscles contract and pull on the outer surface of the lungs
E) a positive respiratory pressure is created when the diaphragm relaxes
Answer: A
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