   Chapter 8, Problem 4RQ

Chapter
Section
Textbook Problem

When alveolar ventilation is 7 L/min and the pulmonary blood flow is 9.5 L/min. the V/Q ratio is aboutA. 0.4B. 0.5C. 0.6D. 0.7

Summary Introduction

Introduction:

The ventilation-perfusion VQ ratio represents the ratio of alveolar ventilation to pulmonary capillary blood flow. This ratio varies throughout the region of the lungs based on the range of ventilation and blood flow to each part. The VQ ratio decreases from the upper region to the lower region in the upright position of the lungs.

Explanation

Justification/ Explanation for the correct answer:

Option (d) is 0.7. When the alveolar ventilation is 7 L/min (Liter/minute) and the pulmonary blood flow is 9.5 L/min, the VQ ratio is,

VQ=79.5=0.7320.7

Hence, option (d) is correct.

Explanation for the incorrect answer:

Option (a) is 0.4. When the alveolar ventilation is 7 L/min and the pulmonary blood flow is 9.5 L/min, the VQ ratio is,

VQ=79.5= 0.732

So, it is an incorrect option

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