The largest muscle in the human body is . . . . . . .

Which characteristic is $NOT$ associated with white muscle fibers?

$A : Ca^{2+}$ plays an important role in muscle contraction.
$R : Ca^{2+}$ combines with the troponin chain,displacing tropomyosin and allowing the myosin head to combine with actin to form an actomyosin complex.

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

Electron microscopic studies of the sarcomeres have revealed that during muscle contraction:

Which muscle band remains unchanged during the contraction and relaxation of the skeletal muscle?