'Gastrocnemius' is a muscle of

Sarcomere is the functional unit of contraction in a muscle fibre. Identify the portion of myofibril that constitutes a sarcomere.

The contractile protein of skeletal muscle involving ATPase activity is

Which muscle is responsible for changes in body posture?

Name the ions responsible for unmasking the active sites on myosin for cross-bridge formation during muscle contraction.

Calcium is important in skeletal muscle contraction because it