PATHOLOGY MCQ
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The volume of air breathed in (or out) during a normal breath at rest
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The volume of air that remains in the lungs after a maximal expiration
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The additional air that can be forcibly inhaled after the inspiration of a normal tidal volume
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The additional air that can be foribly exhaled after the expiration of a normal tidal volume
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Detailed explanation-1: -Introduction. Residual volume (RV) is the volume of air remaining in the lungs after maximum forceful expiration. In other words, it is the volume of air that cannot be expelled from the lungs, thus causing the alveoli to remain open at all times.
Detailed explanation-2: -Residual volume is the amount of air that remains in a person’s lungs after exhaling fully. During the breathing cycle, when air is taken in and let out, the lungs always contain a residual volume of air to ensure that there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.
Detailed explanation-3: -The maximum volume of air remain in lung after forceful expiration is called residual volume. Residual volume prevent lungs from collapse. In human lungs the residual volume is approximately 1000ml-1200ml.
Detailed explanation-4: -The amount of air left in the lungs after forced expiration is residual volume. It is 1100-1200 ml.