Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

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

During very heavy exercise, the

1. pH increases

2. Pa CO 2 decreases

3. Pa O 2 remains constant

4. pH decreases

5. Pa CO 2 increases

A. 1 and 2 only

B. 4 and 5 only

C. 2 and 4 only

D. 2, 3, and 4 only

Summary Introduction


The body inhales both oxygen and carbon dioxide during breathing. The gases diffuse through alveoli into the blood and back to the alveoli in the presence of an optimum pressure. The change in pressure would result in abnormal functioning of the respective phenomena. The blood pH needs to be regulated throughout the body. The pH is also regulated indirectly by the amount of oxygen present in the body to fulfill the requirements.


Explanation for the correct answer:

Option (D) is given as PaCO2 decreases (2), PaO2 remains constant (3), and pH decreases (4), only. The condition when heavy exercise has been performed, the PaCO2 and pH generally decline because of lactic acidosis. Lactic acidosis occurs in a state where the body is not getting enough oxygen to break glucose for energy. The PaO2 remains constant throughout, because the oxygen consumption of cells and alveolar ventilation increase in the same proportions. Hence, option (D) is the correct answer.

Explanation for the incorrect answer:

Option (A) is given as pH increases (1) and PaCO2 decreases (2) only. The situation when the body is unable to fulfill the energy requirement, the body produces lactic acid. If the rate of production is higher than the rate of metabolism, then lactic acidosis occurs, which leads to a decrease in the pH

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