Select the correct option regarding the components of myosin.

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.

Muscle is attached to bone by

Which of the following muscles gets fatigued very early?

$A$ characteristic feature of cardiac muscle is that they are...

The total number of muscles in the human body is: