The Actin Myofilaments are Anchored into the Cytoskeleton of the Cell

Question

The actin myofilaments are anchored into the cytoskeleton of the cell by the __________.
A) Z disks
B) A band
C) M line
D) I band
E) H zone

Accepted Answer

The actin myofilaments are anchored into the cytoskeleton of the cell by the Z disks, which mark the boundary between adjacent sarcomeres. The A band is the region where thick and thin filaments overlap, the M line bisects the A band and anchors thick filaments, the I band contains only thin filaments, and the H zone is the region in the center of the A band where there are no overlapping filaments.