Figure 7-1 Structural Components of a Skeletal Muscle Fiber
Use Figure 7-1 to identify the labeled part.
-Structure J represents a
A) myosin head.
B) sarcomere.
C) T tubule.
D) myofilament.
E) myofibril.

Question

Figure 7-1 Structural Components of a Skeletal Muscle Fiber
Use Figure 7-1 to identify the labeled part.
-Structure J represents a
A) myosin head. 
B) sarcomere. 
C) T tubule. 
D) myofilament. 
E) myofibril.

Quizplus · Accepted Answer

Structure J represents a myofibril, which is a basic rod-like unit of a muscle cell. Myofibrils are made up of a long series of sarcomeres, the contractile units of muscle, and are composed of myofilaments.