In a muscle fiber,$Ca^{++}$ is stored in the .....

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

Select the correct statement with reference to muscle structure.
$I.$ Each myosin is a polymerized protein.
$II.$ Many meromyosin constitute one thick filament (myosin).
$III.$ Each meromyosin's tail is called heavy meromyosin $(HMM)$ and head is called light meromyosin $(LMM)$.
$IV.$ The globular head is an active $ATPase$ enzyme and has binding sites for $ATP$ and active sites for actin.
Choose the option with correct statements.

Mainly,skeletal muscles are named on the basis of:

'Gastrocnemius' is a muscle of

Give scientific reasons: During flight,birds do not fatigue easily.