Chapter 09 The Cardiovascular System

Chapter 09  The Cardiovascular System

Complete Chapter Questions And Answers
 

Sample Questions

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?
a.
fourth
b.
fifth
c.
sixth
d.
seventh

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?
a.
endocardium
b.
mesothelium
c.
myocardium
d.
pericardium

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?
1. endocardium
2. epicardium
3. myocardium
a.
1, 2, and 3
b.
2 and 3
c.
2 only
d.
1 and 3

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?
a.
left atrium (LA)
b.
left ventricle (LV)
c.
right atrium (RA)
d.
right ventricle (RV)

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?
a.
prevents atrial backflow during ventricular contraction
b.
separates the right atrium and the left atrium
c.
separates the right atrium and the right ventricle
d.
separates the right ventricle and the pulmonary artery

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