Chapter 5, Problem 10RQ

### Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

Chapter
Section

### Cardiopulmonary Anatomy & Physiolo...

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

# Compared with the systemic circulation, the pressure in the pulmonary circulation is aboutA. 1 10 the pressureB. 1 4 the pressureC. 1 3 the pressureD. 1 2 the pressure

Summary Introduction

Introduction:

Pulmonary circulation refers to the flow of blood from the right side of the heart to the lungs through the pulmonary trunk. Systemic circulation refers to the flow of blood from the left side of the heart to all the tissues. Pulmonary circulation operates for the oxygenation of the blood, which have been deoxygenated, while the systemic circulation is for the distribution of blood throughout the body. The pressure in the vessels of both these circulatory systems varies. The pressure in the pulmonary circulation is low as compared to that in the systemic circulation.

Explanation

Option (a) is given as 1/10 the pressure. The pulmonary artery has a mean pressure of 15Â mm Hg and the pressure in the left atrium is 5Â mm Hg. Thus, for the blood to move through the lungs, 15mm Hg â€“ 5mm Hg = 10Â mm Hg driving pressure is needed. Similarly, the driving pressure needed in systemic circulation is 98Â mm Hg, which is 10 times more than the pressure in the pulmonary circulation. Hence, option (a) is correct.

Option (b) is given as 1/4th the pressure. It is incorrect because the mean right arterial pressure is 2Â mm Hg and the mean intravascular pressure in the aorta is 100Â mm Hg. Therefore, the driving pressure needed in systemic circulation is 98Â mm Hg. Also, the driving pressure needed in pulmonary circulation is 10Â mm Hg, which is about 10 times less. Hence, option (b) is incorrect.

Option (c) is given as 1/3 the pressure...

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