According to the sliding filament model of muscle contraction, a sarcomere contracts when its
A) thick filaments slide across its Z lines.
B) thin filaments slide across its Z lines.
C) thin filaments slide along its thick filaments.
D) thick filaments move closer together.

Question

Quizplus · Accepted Answer

The sliding filament model of muscle contraction describes how muscle fibers contract by the thin filaments (actin) sliding along the thick filaments (myosin), which pulls the Z lines closer together and shortens the sarcomere.

According to the Sliding Filament Model of Muscle Contraction, a Sarcomere