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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

Over the course of life, the diffusion capacity decreases by about

A. 5 percent

B. 10 percent

C. 15 percent

D. 20 percent

Summary Introduction

Introduction:

Diffusing capacity or transfer factor is the measure of the transfer of gas from air in the lungs to the red blood cells. It progressively decreases after 20 years of age.

Explanation

Justification for the correct answer:

Option (D) states that over the course of one’s life, the diffusion capacity decreases by about 20 percent (%). This is a true statement, as after the age of 20, the diffusing capacity decreases. It falls about 20% over the period of adulthood, at a rate of 2 milliliter per minute per millimeter of mercury. This occurs due to the decreased pulmonary capillary blood flow. Hence, option (D) is correct.

Justification for the incorrect answers:

Option (A) states that over the course of life, the diffusion capacity decreases by about 5 %...

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