Where is myoglobin found?

The muscles immune to fatigue are

$ATP$ binding site is located on the

The muscles which can retract are known as:

Provide the full names for the following structures found in muscle fibers:
$(1)$ $Z-$ disc
$(2)$ $H-$ zone

$A : Ca^{2+}$ 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.