Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

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

With advancing age, the

1. Paco2 increases

2. PaO2 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

Summary 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.


Justification for the correct answer:

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.

Justification for the incorrect answers:

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

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