Figure 7-1 Structural Components of a Skeletal Muscle Fiber
Use Figure 7-1 to identify the labeled part.
-Structure B
A) protects the myofibrils.
B) attaches to actin molecules.
C) produces ATP.
D) conducts nerve impulses through the muscle cell.
E) stores calcium.

Question

Figure 7-1 Structural Components of a Skeletal Muscle Fiber
Use Figure 7-1 to identify the labeled part.
-Structure B
A) protects the myofibrils. 
B) attaches to actin molecules. 
C) produces ATP. 
D) conducts nerve impulses through the muscle cell. 
E) stores calcium.

Quizplus · Accepted Answer

Structure B in Figure 7-1 represents the sarcoplasmic reticulum, which is responsible for storing calcium ions that are necessary for muscle contraction.