The thin filaments of a muscle fiber are made up of

Each myofibril of a muscle contains:

Draw the diagram of a sarcomere of skeletal muscle showing different regions.

$A$ motor unit is a

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.

Muscles are attached to bones by which of the following?