Calmodulin

Actin

Tropomyosin

Troponin

Myosin

explains why long muscles are capable of developing higher forces than short muscles.

  is a consequence of the overlapping organization of the thick and thin filaments within sarcomeres.

arises because of the attachment of skeletal muscles to the bones of the skeleton.

 ensures that skeletal muscles can develop high levels of force, irrespective of their length.

A muscle twitch describes a single muscle contraction.

A muscle twitch describes the contraction when the individual muscle contractions have fused smoothly.

A muscle twitch describes the optimal muscle position when active force is greatest.

A muscle twitch occurs only when the muscle contracts isometrically.

A muscle twitch occurs only when the muscle contracts isotonically.