The monomeric protein which polymerises to form myosin is

It is known that red muscle fibres in animals can work for longer periods of time continuously. How is this possible?

Globular head with a short arm and a tail are the two important parts of

Actin filament is made up of

'Oxygen debt' is the amount of oxygen required for

Relaxation of the muscle takes place due to
$I.$ Pumping of $Ca^{2+}$ ions into the sarcoplasmic reticulum
$II.$ Presence of $ATP$
$III.$ Conformational changes in troponin and masking of the actin filament
Which of the following options contains the correct statements?