Which muscle is responsible for changes in body posture?

During muscular contraction,which of the following events occur?
$(a)$ $'H'$ zone disappears
$(b)$ $'A'$ band widens
$(c)$ $'I'$ band reduces in width
$(d)$ Myosin hydrolyzes $ATP$,releasing the $ADP$ and $Pi$
$(e)$ $Z$-lines attached to actins are pulled inwards
Choose the correct answer from the options given below.

Neuromuscular junction is a junction between

The contraction of muscle of shortest duration is seen in

It is known that red muscle fibres in animals can work for longer periods of time continuously. How is this possible?

The backward bending of the shank is worked out by