Chapter 09: The Cardiovascular System

Chapter 09: The Cardiovascular System

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

MULTIPLE CHOICE

1. The apex of the heart (tip of the left ventricle) lies just above the diaphragm at a level corresponding to which intercostal space?

ANS:  B

The apex of the heart is formed by the tip of the left ventricle and lies just above the diaphragm at the level of the fifth intercostal space.

DIF:    Application    REF:   p. 204            OBJ:   1

2. What is the loose membranous sac that encloses the heart?

ANS:  D

The heart resides within a loose, membranous sac called the parietal pericardium.

DIF:    Recall             REF:   p. 205            OBJ:   1

3. Tissue layers making up the heart wall include which of the following?
4. endocardium
5. epicardium
6. myocardium

ANS:  A

The heart wall consists of three layers: (1) the outer epicardium, (2) the middle myocardium, and (3) the inner endocardium.

DIF:    Application    REF:   p. 205            OBJ:   1

4. Most of the muscle mass of the heart is located in which chamber?

ANS:  B

The two lower heart chambers, or ventricles, make up the bulk of the heart’s muscle mass and do most of the pumping that circulates the blood (Figure 9-2). The mass of the left ventricle is approximately two thirds larger than that of the right ventricle and has a spherical appearance when viewed in anteroposterior cross section.

DIF:    Application    REF:   p. 205            OBJ:   2

5. The mitral (bicuspid) valve does which of the following?

ANS:  A

The valve between the left atrium and ventricle is the bicuspid, or mitral, valve. The AV valves close during systole (contraction of the ventricles), thereby preventing backflow of blood into the atria.

DIF:    Application    REF:   p. 208            OBJ:   1