The contraction of skeletal muscles is based on
A) actin filaments coiling up to become shorter.
B) myosin filaments coiling up to become shorter.
C) actin and myosin filaments both coiling up to become shorter.
D) actin cross-bridges binding to myosin and then flexing.
E) myosin cross-bridges binding to actin and then flexing.

Question

Quizplus · Accepted Answer

The contraction of skeletal muscles involves myosin cross-bridges (or heads) binding to actin filaments and then flexing, which pulls the actin filaments closer together, shortening the muscle. This process is known as the sliding filament theory.

The Contraction of Skeletal Muscles Is Based on