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NBME 19 Answers

nbme19/Block 3/Question#12

23 yo woman engages in 30 minutes of strenuous exercise

Increased, as a result of distention and recruitment of microvessels

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High cardiac output to the pulmonary circulation during exercise will cause the distension and recruitment of micovessels and that would cause the increase in total cross-sectional area.

Here are two images that illustrate this principle nicely: