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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

Solutions

Chapter
Section
BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

Which of the following cause(s) pulmonary vasoconstriction?

1. Hypercapnia

2. Hypoxia

3. Acidemia

4. Increased H+ concentration

A. 3 only

B. 2 and 4 only

C. 2, 3, and 4 only

D. 1, 2, 3, and 4

Summary Introduction

Introduction:

Pulmonary vasoconstriction is a physiological phenomenon. It causes the pulmonary vessels to constrict due to low levels of oxygen in the small pulmonary arteries or alveolar hypoxia.

Explanation

Justification for the correct answer:

Option (d) is given as “hypercapnia, hypoxia, acidemia, and increased H+ concentration cause pulmonary vasoconstriction.” Decreased alveolar oxygen pressure, that is hypoxia, causes the pulmonary vessels to constrict. The reason behind this is that the lung parenchyma releases a substance for the vasoconstriction to occur in response to alveolar hypoxia. With a sudden increase in Pco2 or partial pressure of carbon dioxide (hypercapnia), there is an increase in H+ concentration (decreased pH, acidemia), which causes vasoconstriction. Hence, option (d) is correct.

Justification for the incorrect answers:

Option (a) is given as “only acidemia causes pulmonary vasoconstriction

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