When do the accessory respiratory muscles become active?
A. The muscles of expiration are the abdominal and diaphragm muscles.
B. The muscles of expiration are the abdominal and internal intercostals muscles.
C. The muscles of expiration are the external and internal intercostals muscles.
D. Exhalation is a passive process and does not require the action of any muscles
Answer: B. The muscles of expiration are the abdominal and internal intercostals muscles.
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