Locomotion

A) Principle :

bone + joint + muscle

Bone : Provide surface for muscle attachment

Bone and Joint : Forming lever system

Muscle : contraction provide effort to the lever system , Antagonistic pair of skeleton attached to bone to provide movements in opposite direction

B) Sliding-filament Hypothesis :

1. At arrival of action potential, it propagates along the sarcolemma.
2. Formation of cross-bridge between myosin and action
3. Actin slide toward myosin cause shorten of sarcomere, then cause shortening of muscle fibre
4. ATP is consumed and provided by mitochondria