Which part of the muscle cell actually does the work of contraction by attaching,pivoting,and pulling?

Question

Quizplus · Accepted Answer

Myosin heads are the part of the muscle cell that attach, pivot, and pull on actin filaments during muscle contraction. Calcium ions and neurotransmitter molecules play important roles in initiating and regulating muscle contraction, but they do not directly perform the mechanical work of contraction.

Which Part of the Muscle Cell Actually Does the Work