In a sarcomere,which letter is associated with the thin dark line in the middle of an I band?
A)A
B)Z
C)M
D)H

Question

Quizplus · Accepted Answer

The thin dark line in the middle of an I band is called the Z line. It marks the border between adjacent sarcomeres and anchors the thin filaments (actin) in place. Option A is incorrect because the A band is the region that contains both thin and thick filaments. Option C is incorrect because the M line is the center of the H zone and anchors the thick filaments (myosin) in place. Option D is incorrect because the H zone is the region of the A band where there are only thick filaments.

In a Sarcomere,which Letter Is Associated with the Thin Dark