In the center of each $I$-band is an elastic fiber called the $......$ which bisects it.

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

The immediate regeneration of $ATP$ used up during muscle contraction is facilitated by

Describe the important steps in muscle contraction.

The plasma membrane of the muscle fibre is called

Which of the following interacts with skeletal muscles to produce movement?