The muscles which can retract are known as:

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

Describe the important steps in muscle contraction.

$A$ sarcomere in the myofibrils of muscle is found in between

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.

During muscle contraction,$ATP$ provides energy for