Figure 20-1 The Heart
Use Figure 20-1 to answer the following question:
-Identify the structure labeled "8."
A)moderator band
B)pectinate muscles
C)papillary muscles
D)trabeculae carneae
E)chordae tendineae

Question

Figure 20-1 The Heart
Use Figure 20-1 to answer the following question:
-Identify the structure labeled "8."
A)moderator band 
B)pectinate muscles 
C)papillary muscles 
D)trabeculae carneae 
E)chordae tendineae

Quizplus · Accepted Answer

The structure labeled "8" is the papillary muscles. They are cone-shaped muscular projections within the ventricles of the heart that attach to the chordae tendineae, which in turn attach to the cusps (leaflets) of the heart valves. Their contraction helps to anchor the chordae tendineae and prevent the valves from opening too far during systole (contraction) of the heart.

Figure 20-1 the Heart