The ________ is the functional unit of skeletal muscle because it is the smallest portion of the skeletal muscle capable of ___________.
A) muscle fiber, receiving a stimulus
B) muscle fiber, contracting
C) sarcomere, contracting
D) sarcomere, receiving a stimulus
E) myofibril, contracting

Question

Quizplus · Accepted Answer

The sarcomere is the functional unit of skeletal muscle because it is the smallest portion of the skeletal muscle capable of contracting. The muscle fiber is a collection of sarcomeres and does not have the ability to contract on its own. The myofibril is also a collection of sarcomeres and therefore is not the smallest functional unit of skeletal muscle.

The ________ Is the Functional Unit of Skeletal Muscle Because