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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

During acute alveolar hypoventilation, the blood

1. H 2 CO 3 increases

2. pH increases

3. HCO 3 - increases

4. P co 2 increases

A. 2 only

B. 4 only

C. 2 and 3 only

D. 1,3, and 4 only

Summary Introduction

Introduction:

Acute alveolar hyperventilation is defined as the decrease in the partial pressure of carbon dioxide due to excessive ventilation. It is of two types, that is, acute and chronic. In acute alveolar hyperventilation, the ventilation increases out of proportion to carbon dioxide production.

Answer

Correct answer:

During acute alveolar hypoventilation, the levels of carbonic acid (H2CO3), bicarbonate ions (HCO3), and the partial pressure of carbon dioxide (Pco2) in the blood increase.

Explanation

Justification/explanation for the correct answer:

Option (D) states that the levels carbonic acid, bicarbonate ions, and the partial pressure of carbon dioxide increase during acute alveolar hypoventilation. Acute alveolar hypoventilation is defined as the increase in the partial pressure of carbon dioxide due to insufficient ventilation. This results an increase in carbonic acid H2CO3, bicarbonate ions HCO3, and the partial pressure of carbon dioxide Pco2. Hence, option (D) is correct.

Explanation for the incorrect answers:

Option (A) states that during acute alveolar hypoventilation, the pH (potential of hydrogen) increases. This is incorrect because the pH does not increase in acute alveolar hypoventilation. It rather decreases due to the accumulation of bicarbonate ions. So, it is an incorrect option.

Option (B) states that during acute alveolar hypoventilation, only the Pco2 increases. But in reality, the levels of carbonic acid (H2CO3) and bicarbonate ions (HCO3) increase during acute alveolar hypoventilation along with the Pco2. So, it is an incorrect option.

Option (C) states that during acute alveolar hypoventilation, the pH increases and the concentration of bicarbonate ions HCO3 increases. This is incorrect because pH does not increase during acute alveolar hypoventilation. So, it is an incorrect option.

Hence, options (A), (B), and (C) are incorrect.

Conclusion

Therefore, it is concluded that during acute alveolar hypoventilation, the levels of carbonic acid (H2CO3), bicarbonate ions (HCO3) and the partial pressure of carbon dioxide (Pco2) increase.

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