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Alinara [238K]
3 years ago
11

When the diaphragm and rib cage muscles relax,

Health
2 answers:
boyakko [2]3 years ago
6 0
Expiration occurs. When the diaphragm and rib cage muscles relax you let air out. Kinda like a sense of relief
kiruha [24]3 years ago
3 0
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