Question

a sarcomere extends from one ______ to the next.

o z line
o a band
o i band
o t tubule

Explanation:

A sarcomere is the basic contractile unit of muscle fibers. It is defined as the region between two Z - lines. The A - band is the dark - staining region containing thick filaments, the I - band is the light - staining region with thin filaments, and T - tubules are invaginations of the muscle cell membrane.

Answer:

A. Z line