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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 agents cause pulmonary vascular constriction?

1. Isoproterenol

2. Epinephrine

3. Oxygen

4. Dopamine

A. 3 only

B. 2 and 4 only

C. 1,2, and 4 only

D. 1,2,3, and 4

Summary Introduction

Introduction:

The circulatory system’s vascular network is composed of two subdivisions, namely the pulmonary system and the systemic system. The pulmonary system starts with the pulmonary trunk and terminates in the left atrium. The systemic system starts with the aorta and terminates in the right atrium. These systems are composed of veins, venules, arteries, arterioles, and capillaries.

Explanation

Justification for the correct answer:

Option (B) states that epinephrine (2) and dopamine (4) are the only agents that can cause pulmonary vascular constriction. Vasoconstriction and vasodilation are brought about by the vasomotor center. It regulates the sympathetic impulses that leave the medulla. Epinephrine and dopamine can cause vascular constriction. Hence, option (B) is correct.

Justification for the incorrect answers:

Option (A) states that oxygen (3) is the only agent that can cause pulmonary vascular constriction. A low level of oxygen causes a reflex contraction of the vascular smooth muscles, which is called hypoxic pulmonary vasoconstriction (HPV). A normal concentration of oxygen does not result in pulmonary vascular contraction...

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