Discuss the roles of agonists,antagonists,synergists,and fixators in movement.

The agonist (prime mover)contracts to cause a particular movement.The antagonist causes the opposite action,and so,must relax while the agonist contracts.Synergists prevent unwanted movements during an action or aid the agonist during the movement,while fixators stabilize the origin of the agonist.Both allow the agonist to work more efficiently.