Contraction of a muscle is caused by

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?

The main source of energy during muscle contraction is

Where is myoglobin found?

The mineral element required for blood clotting is also essential for which other process?