During a transition from a standing to a supine (lying flat) position, which lung capacity is most significantly reduced?
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Correct answer: Functional Residual Capacity (FRC)
When lying supine, the abdominal contents push upward against the diaphragm due to gravity, which reduces the resting volume of the lungs. This primarily results in a decrease in the Expiratory Reserve Volume (ERV) and thus the FRC.
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