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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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Chapter
Section
BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

At rest, the normal pleural pressure change during quiet breathing is about

A. 0-2 mm Hg.

B. 2-4 mm Hg.

C. 4-6 mm Hg.

D. 6-8 mm Hg.

Summary Introduction

Introduction:

The pleura is the membrane that surrounds the lungs. It is two-layered. One of the layers is in contact with the lung and the other is in contact with the thoracic cavity. A fluid is present in the space between these two layers, which is called the pleural cavity. The pleural pressure also acts in the pleural cavity surrounding the lungs. It is a negative pressure, which means it is less than the atmospheric pressure. There are different modes of breathing. One of them is quiet breathing, which is also known as eupnea. This type of breathing occurs in rest and does not require the person to consciously think for the process. Quiet breathing can be simply referred to as the resting respiratory rate.

Explanation

Justification/explanation for the correct answer:

Option (b) is given as “2–4 mm Hg.” The range of normal pleural pressure is about 2.5 mm Hg during the rest state. It is always in negative and is below the barometric pressure. Hence, option (b) is correct.

Explanation for the incorrect answers:

Option (a) is given as “0–2 mm Hg.” It usually takes place during the start of inspiration. The exertion of the diaphragm is about 1.5 cm during normal breathing. This infers to a pleural pressure change of about 2 to 4 mm Hg...

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