The muscles involved in the movement of the arm are

It is not a characteristic of cardiac muscles.

Flexion of the thigh,knee,and their rotation is facilitated by:

The stored food material found in muscles is

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.

In a skeletal muscle fiber,how many actin filaments surround each myosin filament?