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, makeup 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 ap-proximately two-thirds larger than that of the right ventricle and has a spherical appearance when viewed in anteroposterior cross section.
Health Professions
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