Functionally, the muscle fiber's fundamental unit of contraction is the
A) thick filament.
B) myofibril.
C) sarcomere.
D) Z line.

Question

Quizplus · Accepted Answer

The sarcomere is the basic functional unit of contraction in a muscle fiber. It is the region between two Z lines and contains the actin and myosin filaments responsible for muscle contraction. The other options (A, B, and D) are components of the sarcomere but are not the fundamental unit of contraction.

Functionally, the Muscle Fiber's Fundamental Unit of Contraction Is the