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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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Chapter
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BuyFindarrow_forward

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 about

A. 1 10 the pressure

B. 1 4 the pressure

C. 1 3 the pressure

D. 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

Justification for the correct answer:

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

Justification for the incorrect answers:

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