Question

part a which region of the sarcomere gives rise to the structure (band or line) indicated by the arrow? the boundary between adjacent sarcomeres the region of the sarcomere that contains only thin filaments the point of connection for adjacent thick filaments the region of the resting sarcomere that only contains thick filaments

Explanation:

The Z - line is the boundary between adjacent sarcomeres. In the structure of a sarcomere, the I - band contains only thin filaments, the H - band contains only thick filaments, and the A - band contains both thick and thin filaments. The Z - line serves as the connection point that demarcates one sarcomere from the next.

Answer:

the boundary between adjacent sarcomeres