The dark band present on a myofibril is known as:

$A$: Latent period is the interval between the application of an appropriate stimulus and the initiation of contraction.
$R$: Latent period is minimum in cardiac muscle fibres.

The actin filament is shown below. Where does $Ca^{++}$ bind during muscle contraction?

Sarcolemma is a membrane found over in

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

Visceral muscles are involved in which functions?