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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

Solutions

Chapter
Section
BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

When alveolar ventilation is 7 L/min and the pulmonary blood flow is 9.5 L/min. the V/Q ratio is about

A. 0.4

B. 0.5

C. 0.6

D. 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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