What is the functional unit of a skeletal muscle called?
A) a sarcomere
B) a myofilament
C) a myofibril
D) the sarcoplasmic reticulum

Question

Quizplus · Accepted Answer

The functional unit of a skeletal muscle is called a sarcomere. It is the smallest contractile unit of muscle and is composed of overlapping thick and thin filaments called myofilaments.

Answer choices B, C, and D are incorrect because myofilaments make up the sarcomere, myofibrils are composed of sarcomeres, and the sarcoplasmic reticulum is an organelle that stores calcium ions and plays a role in muscle contraction, but it is not the functional unit of a skeletal muscle.

What Is the Functional Unit of a Skeletal Muscle Called