Which of the following marks the boundaries of a sarcomere?
A) I bands
B) H bands
C) Z discs
D) M lines
E) A bands

Question

Quizplus · Accepted Answer

Z discs mark the boundaries of a sarcomere. They are the attachment sites for actin filaments and are responsible for the organization of the sarcomere. The I band is the region of the sarcomere with only thin filaments, while the H band is the region with only thick filaments. The M line is the center of the sarcomere and anchors the thick filaments, while the A band is the region with both thick and thin filaments overlapping.

Which of the Following Marks the Boundaries of a Sarcomere