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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

During exercise, the stroke volume reaches its peak when the cardiac output is at about what percent of its maximum?

A. 30 percent

B. 40 percent

C. 50 percent

D. 60 percent

Summary Introduction

Introduction:

The body of an individual, doing heavy exercise, is in need of a high amount of oxygen which is required for the body cells and tissues. This provides strength to the muscles and also improves the pumping ability of blood from the heart to lungs and other body parts. The cardiac output increases with an increase in the intensity of exercise.

Explanation

Explanation for the correct answer:

Option (c) is 50 percent. The cardiac output is the amount of blood pumped by the left or right ventricles per unit time, whereas the stroke volume is the amount of blood pumped per beat from the left ventricle. The cardiac output increases after excessive running, and it causes an increase in both, the stroke volume and the heart rate. The peak level of the stroke volume causes a 50 percent increase in the cardiac output. Hence, option (c) is the correct answer.

Explanation for the incorrect answer:

Option (a) is 30 percent. The cardiac output of the normal individual is 20–25 L/min and the cardiac output of a well-trained athlete increases up to 35 L/min. The change in the cardiac output is according to the change in stroke volume. Heavy exercise causes an increase in the cardiac output, which is approximately 50 percent...

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