Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

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

During maximum exercise, the oxygen diffusion capacity may increase as much a

A. 3-fold

B. 6-fold

C. 9-fold

D. 12-fold

Summary Introduction


Diffusion capacity measures the transference of oxygen from air into the lungs and the red blood cells (RBCs). The blood carries oxygen and takes up carbon dioxide from the entire body. This also depends upon the optimum working of both lungs. The exchange of gases among the organs and blood occurs because of their respective partial pressure gradients, which result in diffusion.


Explanation for the correct answer:

Option (A) states that there is a rise in oxygen diffusion capacity up to threefold at the time of maximum exercise. The transportation of oxygen to the required places and carrying carbon dioxide from there is done with the help of blood. This transportation of oxygen via blood depends on the respective partial pressures of the two gases, oxygen and carbon dioxide, which diffuse according to the gradient present. There is a linear increase in oxygen diffusion with oxygen consumption. Hence, option (A) is the correct answer.

Explanation for the incorrect answer:

Option (B) states that the oxygen diffusion capacity increases up to sixfold at the time of very heavy exercise. The diffusion capacity varies with the working of the lungs. The diseased patients or the patients with a single lung may affect the oxygen diffusion capacity of lungs...

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