Biology for IGCSE & O level - Gas Exchange In Humans (Section 4 - No. 24)
During exercise, which of the following happens to the muscles involved in breathing? (Select all that apply)
The intercostal muscles contract more frequently.
The diaphragm contracts more forcefully.
The intercostal muscles relax more frequently.
The diaphragm relaxes more forcefully.
Explanation
During exercise the breathing muscles work more to increase oxygen intake.
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