Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

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

An individual's pulmonary vascular resistance decreases in response to

1. Bradykinin

2. Emphysema

3. Norepinephrine

4. Hypercapnia

A. 1 only

B. 2 only

C. 3 and 4 only

D. 2 and 3 only

Summary Introduction


The pulmonary vascular resistance represents the pressure on the right ventricle, against which, the heart must pump to remove blood (afterload) during systole. It is altered by many factors, including chemical stimuli, drugs, lungs hyperinflation, immunogenic substances, and pathological factors.


Justifications/ Explanations for the correct answer:

Option (a) is given as 1 only. An individual pulmonary vascular resistance decreases in response to bradykinin. It is a non-peptide chemical that mediates vasodilation of blood vessels in the heart and thus, increases the blood flow in capillaries supplied by pulmonary blood. This results in an increased cardiac output and a decrease in the pulmonary vascular resistance. Hence, option (a) is correct.

Explanation for the incorrect answer:

Option (b) is given as 2 only. Emphysema is a chronic lung disorder in which alveoli are damaged, decreasing both the alveolar perfusion and ventilation. The exchange of gases in the body is severely impaired, leading to pulmonary vasoconstriction and ventricular dysfunction which causes the vascular resistance to increase. So, it is incorrect.

Option (c) is given as 3 and 4 only. Nor-epinephrine drugs causes vasoconstriction of cardiac muscles which leads to decreased blood flow to the pulmonary capillaries and as a result, vascular resistance increases...

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

What are the features of a healthy high-fat diet?

Understanding Nutrition (MindTap Course List)

An eating pattern with sufficient essential fatty acids includes a. nuts and vegetable oils. b. 1/4 cup of raw ...

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

What are the base-pairing rules for DNA? a. AG, TC b. AT, GC c. AC, TG d. AA, GG, CC, TT

Biology: The Unity and Diversity of Life (MindTap Course List)

How many autosomes are present in a body cell of a human being? In a gamete?

Human Heredity: Principles and Issues (MindTap Course List)

Why isn’t there an eclipse at every new moon and at every full moon?

Horizons: Exploring the Universe (MindTap Course List)

Describe the general structure of a neuron.

Chemistry for Today: General, Organic, and Biochemistry

Is the work required to be done by an external force on an object on a frictionless, horizontal surface 10 acce...

Physics for Scientists and Engineers, Technology Update (No access codes included)