do lungs become empty after forceful expiration? explain
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Residual volume (RV) is the volume of air that remains in the lungs after maximum forceful expiration. In other words, it is the volume of air that cannot be expelled from the lungs. This volume remains unchanged regardless of the lung volume at which expiration was started.
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The lungs do not collapse even after forceful expiration as the lungs never become empty.There is always some amount of air left in the lungs which is known as residual volume.
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