The largest muscle in the human body is:

Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.

How is $G$-actin converted into $F$-actin?

Choose the correct properties of muscle fibres.
$I.$ Muscle fibre is lined by the plasma membrane called sarcolemma.
$II.$ Cytoplasm of the muscle fibre is called tonoplasm.
$III.$ Sarcolemma of the muscle fibre encloses the sarcoplasm.
$IV.$ Muscle fibre is a syncytium.
Select the correct option.

Describe the important steps in muscle contraction.

Which ion is essential for muscle contraction?