MediumZoologyBreathing and Exchange of Gases
+4 / -1
During forced expiration, which muscles contract actively?
A
Diaphragm and external intercostals
B
Internal intercostals and abdominal muscles
C
Sternocleidomastoid and scalenes
D
Diaphragm and internal intercostals
Explanation
During forced/active expiration: internal intercostals contract and abdominal muscles compress contents pushing diaphragm upward.
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