What is the change in FRC in healthy persons shifting from the sitting to the supine position?
A. FRC decreases by 50%.
B. FRC decreases by 25%.
C. FRC increases by 50%.
D. FRC increases by 25%.
?ANS: B
A. Incorrect response: See explanation B.
B. In healthy subjects, moving from the sitting position to the supine position reduces the FRC by 25%.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.
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