The $Quadriceps$ and $Gastrocnemius$ muscles are located in the:

$A -$ Calcium ions $(Ca^{2+})$ activate the interaction between myosin and actin filaments.
$R -$ The cross-bridge is formed in the presence of $ATP,$ and the breaking of the cross-bridge also requires the binding of a new $ATP$ molecule.

Which of the protein is not a part of thin myofilament?

In the center of each $I$-band is an elastic fiber called the $......$ which bisects it.

Give information regarding characteristics of muscles and its types.

In the resting state,a subunit of troponin masks the active binding sites for .......... on the .......... filaments.