MediumZoologyBreathing and Exchange of Gases
+4 / -1
Expiration is a passive process that occurs when:
A
Diaphragm and external intercostal muscles relax
B
Diaphragm and external intercostal muscles contract
C
Internal intercostal muscles relax
D
Abdominal muscles relax
Explanation
Normal expiration is passive and results from the elastic recoil of the lungs and the relaxation of inspiratory muscles.
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