# With advancing age, the 1. Pa co2 increases 2. Pa O2 decreases 3. P ( A-a ) O 2 decreases 4. C ( a − v ¯ ) O 2 decreases A. 1 only B. 2 only C. 3 and 4 only D. 2 and 4 only

### Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
Publisher: Cengage Learning,
ISBN: 9781337794909

### Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
Publisher: Cengage Learning,
ISBN: 9781337794909

#### Solutions

Chapter
Section
Chapter 11, Problem 5RQ
Textbook Problem

## With advancing age, the1. Paco2 increases2. PaO2 decreases3. P ( A-a ) O 2 decreases4. C ( a − v ¯ ) O 2 decreasesA. 1 onlyB. 2 onlyC. 3 and 4 onlyD. 2 and 4 only

Expert Solution
Summary Introduction

Introduction:

As all functions of the body deteriorate with age, lung functioning is also affected. The lungs lose their elasticity and the dynamics of ventilation also have specific effects. The deterioration is observed with a decrease in dynamic lung functions. Till the age of 20-25 years, the lungs reach the maximum indices of growth and development. After this, the lung functioning gradually deteriorates.

### Explanation of Solution

Option (D) states that with advancing age, the PaO2 decreases and C (a - V) O2 decreases (2 and 4 only). This is a true statement, as with age, the PaO2, defined as the arterial blood gas, decreases. It should be maintained at 90 millimeter of mercury, before the age of 45. After 45 years of age, it declines gradually.

Also, the C (a - V) O2 decreases with age. C (a - V) O2 is the maximum arterial-venous oxygen content difference. It tends to decrease because of factors such as physical fitness, less efficient blood distribution, and reduced tissue enzyme activity. Hence, option (D) is correct.

Option (A) states that (1 only) with advancing age, the PaO2 increases...

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