When you are breathing normally, exhalation results mainly from

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During normal breathing, exhalation occurs primarily due to the relaxation of the diaphragm and muscles between the ribs, rather than active contraction of muscles in the chest or diaphragm. As these muscles relax, the volume in the chest cavity decreases, causing air to be pushed out of the lungs. Low pressure in the lungs can also contribute to exhalation, but it is not the primary cause.

When You Are Breathing Normally, Exhalation Results Mainly from