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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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Chapter
Section
BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

In the healthy individual in the upright position, the

1. V/Q ratio is highest in the lower lung regions

2. PA co 2 is lowest in the upper lung regions

3. V/Q ratio is lowest in the upper lung regions

4. PA co 2 is highest in the lower lung regions

A. 1 only

B. 2 only

C. 4 only

D. 3 and 4 only

Summary Introduction

Introduction:

VQ (ventilation–perfusion) is the relationship between alveolar ventilation and pulmonary capillary blood flow. The average ratio of ventilation to blood flow is 4:5 or 0.8. It affects the oxygen and carbon dioxide pressure in the alveoli.

Explanation

Justification/explanation for the correct answer:

Option (b) states that for a healthy individual in the upright position, the PACO2 is the lowest in the upper lung regions. When a healthy individual is in the upright position due to limited blood flow to the alveoli, the VQ ratio becomes higher, that is, the perfusion rate is lowered and the venous blood is unable to fulfill the carbon dioxide (CO2) level in the alveoli at the rate it is removed out of the alveoli, leading to decreased PACO2 in the alveoli.

Option (c) states that PACO2 is the highest in the lower part of the lungs. A normal individual in upright position receives a moderate amount of ventilation and little blood flow in the upper portions of the lungs. As a result, the VQ ratio in the upper lung, which is higher than 0.8. T PACO2, falls significantly. In the lower region of the lung, alveolar ventilation increased along with increased blood flow. PACO2 is increased in lower regions of the lungs

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