During contraction in a skeletal muscle fiber:

Question

Quizplus · Accepted Answer

During contraction in a skeletal muscle fiber, myosin cross-bridges (heads) attach to actin in the thin filaments and pull them towards the center of the sarcomere, causing the thin filaments to slide past the thick filaments. This sliding filament mechanism is responsible for muscle contraction. The sarcomere shortens, bringing Z lines closer together, but the filaments themselves do not change in length; instead, they slide past each other.

During Contraction in a Skeletal Muscle Fiber