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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

The residual volume/total lung capacity ratio in healthy men ages 20 to 30 years is

A. 15%

B. 20%

C. 25%

D. 30%

Summary Introduction

Introduction:

Residual volume (RV) can be defined as the volume of air that remains in the lungs after a forced expiratory reserve volume (ERV). It is important for the overall exchange of gas and opening of alveoli. Total lung capacity (TLC) is the maximum volume of air that can be accommodated by the lungs.

Explanation

Justification for the correct answer:

Option (B) is 20%. The residual volume for a normal adult male is 1200 mL (milliliter) and the total lung capacity in healthy men is 6000 mL. The ratio of residual volume to total lung capacity can be calculated as follows:

Residual volume in normal man=1200 mLTotal lung capacity of a normal man=6000 mLResidual volumeTotal lung capacity=12006000Residual volumeTotal lung capacity=0

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