The Central Region of the a Band That Lacks Thin

Question

The central region of the A band that lacks thin filaments is the:
A)H zone.
B)Z disc.
C)I band.
D)sarcomere.

Accepted Answer

The H zone is the central region of the A band where there are no thin filaments. This region only contains thick filaments made up of myosin. The Z disc is the boundary between adjacent sarcomeres, the I band is the region of thin filaments that extends from the Z disc towards the center of the sarcomere, and the sarcomere is the functional unit of the muscle fiber that contains all the contractile elements.