Cytological examination of resting and contracted muscle provides important support for our current model for how skeletal muscle contracts. This evidence includes the observation that during contraction the
A)muscle fibers change color.
B)Z lines move farther apart.
C)microtubules disassemble.
D)length of the thick and thin filaments change significantly.
E)H zone becomes smaller.

Question

Quizplus · Accepted Answer

During muscle contraction, the H zone, which is the region between the ends of the thin filaments within a sarcomere, becomes smaller as the actin and myosin filaments slide past each other, shortening the sarcomere. This supports the sliding filament theory of muscle contraction.

Cytological Examination of Resting and Contracted Muscle Provides Important Support