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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

Solutions

Chapter
Section
BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

The mean intraluminal pressure in the pulmonary capillaries is

A. 5 mm Hg

B. 10 mm Hg

C. 15 mm Hg

D. 20 mm Hg

Summary Introduction

Introduction:

The blood flows with pressure through the capillaries. The blood in the lumen of the pulmonary capillaries exerts pressure and this pressure is called intraluminal pulmonary capillary pressure.

Explanation

Justification for the correct answer:

Option (b) is 10 mm Hg. The pulmonary capillary pressure determines the fluid filtration from pulmonary capillaries to the interstitium. Pulmonary capillary pressure cannot be directly calculated as it depends on the distribution between precapillary and postcapillary vessels. At the arteriolar end, the intravascular pressure is 15 mm Hg and at the venous end, it is 5 mm Hg. The driving pressure in the pulmonary capillary is 10 mm Hg. Hence, option (b) is correct.

Justification for the incorrect answers:

Option (a) is 5 mm Hg. It is incorrect because the pulmonary capillary pressure would be 10 mm Hg when the average pulmonary arterial pressure is between 12 and 16 mm Hg, and the intravascular pulmonary venous pressure is 5 mm Hg...

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