Biology for IGCSE & O level - Gas Exchange In Humans (Section 1 - No. 35)
Which of the following correctly describes the movement of the diaphragm and the chest volume during inspiration?
Diaphragm relaxes; chest volume decreases.
Diaphragm contracts; chest volume increases.
Diaphragm contracts; chest volume decreases.
Diaphragm relaxes; chest volume increases.
Explanation
The diaphragm contracts and moves downward, increasing the volume of the chest cavity.
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