The diaphragm plays a major role in respiration. During inhalation, the diaphragm:
a. elongates and descends into the abdomen, allowing air to enter the lungs.
b. contracts and creates a negative pressure in the thorax, which draws air into the lungs.
c. relaxes so that it can be stretched as you pull air into the lungs.
d. contracts and increases internal thoracic pressure, which sucks air into the lungs.
Answer: b
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