When the radius of the bronchial airways decreases during exhalation, what change must occur to maintain a constant gas flow?
A. The transthoracic pressure must remain constant
B. The transthoracic pressure must vary inversely with the second power of the radius
C. The transthoracic pressure must vary directly with the fourth power of the radius
D. The transthoracic pressure must vary inversely with the fourth power of the radius
Answer: D
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