Excluding the upper and central airways, where in the lungs of a normal person is the airway resistance the highest?
A. apices
B. middle zone
C. bases
D. Airway resistance is equal throughout these three lung zones.
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: In a normal person, gravitational effects on lung water and required stretch make airway resistance slightly higher in the bases than in other regions of the lungs.
D. Incorrect response: See explanation C.
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