The monomeric protein which polymerises to form myosin is

In the mechanism of muscle contraction or shortening of muscle,the . . . . . . get reduced whereas the . . . . . . retain the length.

At which site do muscle fibers receive stimulation from a motor neuron?

Arrange the given steps of muscle contraction in the series of events from first to last.
$I.$ Myosin head binds to the exposed active site on actin to form a cross bridge.
$II.$ The $Z$-line attached to these actin are also pulled inwards,thereby causing shortening of sarcomere,also called contraction.
$III.$ This pulls the attached actin filaments towards the centre of $A$-band.
The correct option is:

Which type of muscle is multinucleated during its functional state?

The immediate regeneration of $ATP$ used up during muscle contraction is facilitated by