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 heavy exercise, the total cardiac output may increase as much as

A. 2-fold

B. 4-fold

C. 6-fold

D. 8-fold

Summary Introduction


The requirement of oxygen increases during heavy exercise, for body cells and organs to breathe and function properly. The blood pressure increases due to heavy exercise. This strengthens the muscles and also improves the pumping ability of the heart to pump blood to the lungs and other body parts.


Explanation for the correct answer:

Option (d) is given as eightfold. The amount of oxygen needed by active muscles is more than the resting muscles, during heavy exercise. This increases the pumping capacity of the heart and thus, the cardiac output increases due to the increase in the stroke volume and heart rate. Sympathetic discharge, increased cardiac output, arterial blood pressure, pulmonary vascular pressures, and muscle capillary dilation should occur in order to supply adequate blood to working muscles through the circulatory system. Hence, option (d) is the correct answer.

Explanation for the incorrect answer:

Option (a) is twofold. The total cardiac output increases by eightfold while doing heavy exercise, for the maintenance of lower heart rates...

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