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Contraction of the rib cage causes an increase in internal lung pressure that results in the expiration of air from the lungs.

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14y ago
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5mo ago

Air tends to flow out of the lungs when the internal pressure of the lungs is higher than the atmospheric pressure. This pressure difference is created by the contraction of the diaphragm and intercostal muscles during exhalation, which reduces the volume of the lungs and forces air out.

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13y ago

Through the mouth!

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Q: Under what internal condition does air tend to flow out of the lungs?
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Under what internal condition does air flow into the lungs?

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Air flows out of the lungs when the internal pressure is higher than the atmospheric pressure, causing expiration to occur. This pressure gradient is established by the contraction of the diaphragm and intercostal muscles during exhalation.


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