Fast muscle fibres contract spontaneously and reach anaerobic conditions in shorter time, so as to accumulate lactic acid in the muscles in shorter time.

Slow muscle fibres have a better ability to endure, as they are resistant to fatigue and contract slowly, due to accumulation of a large amount of myoglobin in them.

Actin filaments form the isometric band in the muscle fibre because it is the only actin protein which is present in that region.

Sarcomere is the contractile unit of the skeletal muscle.

──────────────────────────────────────────────────────────────────────────────────────────