42. A healthy 35-year-old woman is breathing room air while standing. Which of the following best explains why alveoli at the top of the lungs have a higher Po, than alveoli at the of the lungs in this woman?

Basic Clinical Lab Competencies for Respiratory Care: An Integrated Approach
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Chapter26: Advanced Modes Of Mechanical Ventilation
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42. A healthy 35-year-old woman is breathing room air while standing. Which of the following best explains why alveoli at the top of the lungs have a higher Po, than alveoli at the of the lungs in this woman?
A) Higher perfusion per unit lung volume
B) Higher ratio of ventilation to perfusion
C) Higher ventilation per unit lung volume
D) Lower perfusion per unit lung volume
E) Lower ratio of ventilation to perfusion
F) Lower ventilation per unit lung volume

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