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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

In an obstructive lung disorder, the

1. FRC is decreased

2. RV is increased

3. VC is decreased

4. IRV is increased

A. 1 and 3 only

B. 2 and 3 only

C. 2 and 4 only

D. 2,3 and 4 only

Summary Introduction

Introduction:

Obstructive lung diseases are characterized by the obstruction of the airways. Most of the obstructive diseases result from the obstruction of either smaller or larger bronchioles. These occur because of the excessive contraction of smooth muscles of the airway. Both, lung capacity and lung volume are altered due to obstructive lung disease.

Explanation

Justification for the correct answer:

Option (b) is given as 2 and 3 only. This option is correct as in the obstructive lung diseases, the residual volume (RV) is increased because of the weakening of smooth muscle of bronchioles, a larger amount of air remains in the lungs even after forceful exhalation. As a consequence of weak smooth muscles, the lungs cannot exhale a large amount of air and the vital capacity (VC) is decreased. Hence, option (b) is correct.

Justification for the incorrect answers:

Option (a) is given as 1 and 3 only. This is false as the functional residual capacity (FRC) is increased due to obstructive lung disease...

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