Identify the odd one out from the following list.

$\text{ATP}$ase is located in $:-$

Define the sliding filament theory of muscle contraction.

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.

Which part of a muscle cell is the storehouse of calcium ions?

Give scientific reasons: During flight,birds do not fatigue easily.