When the Radius of the Bronchial Airways Decreases During Exhalation

question 29

Multiple Choice

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

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