Question

which structure is the sarcomere on the diagram below? * diagram with labels a, b, c and options a, b, c as radio buttons

Explanation:

A sarcomere is the basic contractile unit of a muscle fiber, defined as the region between two Z - lines (or Z - discs, labeled as C here). The structure labeled B spans from one Z - line to the next Z - line, which fits the definition of a sarcomere. Structure A is likely a part of the myofilaments within the sarcomere, and C is the Z - line. So the sarcomere is B.

Answer:

B