The largest muscle in the human body is:

Myoglobin is found in

$A$: All muscles follow the 'All or None' principle.
$R$: All muscles contract either fully or not at all depending upon the availability of a threshold stimulus.

$ATP$ binding site is located on the

Actin filament is made up of

Aerobic muscles are called $...A...$ and anaerobic muscles are called $...B....$ Here $A$ and $B$ refer to: