The Area Between Z Lines is The

Question

The area between Z lines is the
A)sarcolemma.
B)sarcomere.
C)sarcoplasmic reticulum.
D)myofibril.
E)myofilament.

Accepted Answer

The Z lines mark the borders of the sarcomere, which is the basic functional unit of a muscle fiber. The sarcomere contains the myofilaments, which are responsible for muscle contraction. The sarcolemma is the muscle cell membrane, while the sarcoplasmic reticulum is an organelle within the muscle cell that stores calcium ions. Myofibrils are structures within the muscle cell that contain many sarcomeres.