Cytological examination of resting and contracted muscle provides important support for the sliding filaments model for how skeletal muscle contracts.This evidence includes the observation that during contraction the
A)Z lines move farther apart.
B)lengths of the thick filaments shorten significantly.
C)lengths of the thin filaments shorten significantly.
D)I bands get longer.
E)H zone becomes narrower.

Question

Quizplus · Accepted Answer

During muscle contraction, the H zone, which is the region in the center of the A band devoid of thin filaments, becomes narrower. This observation supports the sliding filament model, which posits that thin filaments slide past thick filaments, shortening the sarcomere and thus contracting the muscle without changing the length of the filaments themselves.

Cytological Examination of Resting and Contracted Muscle Provides Important Support