BuyFind

Cardiopulmonary Anatomy & Physiolo...

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

Cardiopulmonary Anatomy & Physiolo...

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

Solutions

Chapter
Section
Chapter 5, Problem 12RQ
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

Expert Solution
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 of Solution

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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