The Area in the Center of the a Band That

Question

The area in the center of the A band that contains no thin filaments is the
A) Z line.
B) M line.
C) H band.
D) I band.
E) zone of overlap.

Accepted Answer

The H band contains only thick filaments and is located in the center of the A band where there are no thin filaments. Therefore, option C is the correct answer. Option A (Z line) is incorrect because it is the border between adjacent sarcomeres, and not part of the A band. Option B (M line) is incorrect because it is located in the center of the sarcomere but contains both thick and thin filaments. Option D (I band) is incorrect because it is located on either side of the A band and contains only thin filaments. Option E (zone of overlap) is incorrect because it is the region where thick and thin filaments overlap, not where there are no thin filaments.