Changes occur within a sarcomere during muscle contraction. One change is that the
A)thin filaments get thicker.
B)thick filaments move closer together.
C)Z lines move closer together.
D)thick filaments get thicker.

Question

Quizplus · Accepted Answer

During muscle contraction, the Z lines (which mark the boundaries of each sarcomere) move closer together as the thin filaments slide past the thick filaments. The thick filaments themselves do not change in size or move closer together. The thin filaments do not get thicker, but they do undergo a change in conformation (shape) as they slide past the thick filaments.

Changes Occur Within a Sarcomere During Muscle Contraction