Biology for IGCSE & O level - Gas Exchange In Humans (Section 1 - No. 47)
Which of the following correctly describes the volume changes during expiration?
Rib cage moves down, volume increases
Diaphragm contracts, volume increases
Rib cage moves down, volume decreases
Diaphragm relaxes, volume increases
Explanation
During exhalation, the rib cage moves down and the diaphragm relaxes which causes volume to decrease.
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