The dark band present on a myofibril is known as:

According to the sliding filament theory:

Visceral muscles are involved in which functions?

Actin and myosin proteins are related with

$A$: Muscle tetanus is the phenomenon of sustained contraction of a muscle due to a succession of nerve impulses/stimuli being received by it.
$R$: Many of our daily activities are due to tetanic contraction of muscles,such as holding a book.

Sarcolemma is a membrane found over in