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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

At end-expiration, P ta is

A. 0 mm Hg.

B. 2 mm Hg.

C. 4 mm Hg.

D. 6 mm Hg.

Summary Introduction

Introduction:

A balloon in a bell-shaped jar is used for the demonstration of ventilation. This jar represents the rib cage. The diaphragm is represented by the rubber sheet across the bottom. The movement of the diaphragm causes a decrease in the pleural pressure. This model can be used to demonstrate inspiration, end-inspiration, expiration, and end-expiration.

Explanation

Justification for the correct answer:

Option (a) is given as 0 mm Hg. The diaphragm recoils upward during expiration. This results in a decrease in the size of the thoracic cavity. This increases the intrapleural pressure. As the pressure inside is higher than the atmosphere, the gas flows toward the inside till it reaches equilibrium. At this point, the gas stops flowing and the Pta is zero. Hence, option (a) is correct.

Justification for the incorrect answers:

Option (b) is given as 2 mm Hg...

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