A) diaphragm
B) external intercostals
C) abdominal muscles
D) All of the above
Correct Answer: C
Solution :
Expiration is a passive process that does not require the involvement of any muscular contraction. In a forced expiration, the abdominal muscles increase infra-abdominal pressure and pull the rib-cage downward and inward.You need to login to perform this action.
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