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Expiration is generally considered a passive process during normal breathing. It occurs when the diaphragm and intercostal muscles relax, allowing the lungs to deflate and air to be expelled due to the elastic recoil of the lung tissue. However, during activities like vigorous exercise or in certain respiratory conditions, expiration can become an active process, involving the contraction of abdominal and other accessory muscles to forcefully expel air.

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2mo ago

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