Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
Publisher: Cengage Learning,
ISBN: 9781337794909

Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
Publisher: Cengage Learning,
ISBN: 9781337794909


Chapter 6, Problem 9RQ
Textbook Problem

Assuming everything else remains the same, when an individual's cardiac output decreases, the

1. C ( a -  V ¯ ) o 2 increases

2. O 2 ER decreases

3. V o 2 increases

4. S V ¯ o 2 decreases

A. 1 only

B. 4 only

C. 2 and 3 only

D. 1 and 4 only

Expert Solution
Summary Introduction


Cardiac output is defined as the total amount of blood pumped by the heart. The blood pumped out by the right ventricle or the left ventricle at a particular time can be calculated as the product of heart rate and the stroke volume. The cardiac output for a man who is at rest is 5 L/min (liters/minute).

Explanation of Solution

Explanation for the correct answer:

Option (d) states that an increase in the difference arterial–venous oxygen and a decrease in the mixed venous oxygen saturation occurs when the cardiac output decreases. The arterial–venous oxygen content difference is the difference in the oxygen content of arterial blood and venous blood. The factors that allow changes in the body’s total consumption are cardiac output and arterial–venous oxygen content difference. The mixed venous oxygen saturation helps assess the delivery of tissue oxygen. And this is directly proportional to cardiac output. Hence, option (d) is the correct option.

Explanation for the incorrect answer:

Option (a) states that the cardiac output decreases when the difference between the arterial–venous oxygen content is increased...

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