Biology for IGCSE & O level - Gas Exchange In Humans (Section 3 - No. 49)
What happens to the muscles of the rib cage during exhalation?
Contract and lift the ribs.
Contract and lower the ribs.
Relax, allowing the ribs to move down and in.
Remain contracted throughout exhalation.
Explanation
The muscles relax, allowing the rib cage to return to its normal position.
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