Science第 62 / 120 题
During inhalation, the diaphragm contracts and moves in which direction?
a.Upward
b.Sideways
c.It does not move
d.Downward
解析
When the diaphragm contracts, it flattens and moves downward, increasing the volume of the chest cavity and drawing air into the lungs. During exhalation it relaxes and moves upward.
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