1. muscle that opposes and reverses the action of another muscle.
2. muscle that stabilizes the origin of another muscle.
3. muscle that is primarily responsible for bringing about a particular movement.
4. muscle that aids another by promoting the same movement.

1. antagonist

2. fixator

3. agonist

4. synergists

Explanation:

The muscles that do not allow any contraction at the time of movement is called antagonist. These muscles opposes the action of another muscle. These muscles remains in resting state, also reverses the action of another muscle.The fixator is the muscle that stabilizes the origin of another muscle or agonist. The fixator helps the agonists to function in a effective manner. Thus, fixator is a muscle that opposes and reverses the action of another muscle.The prime mover muscle that is responsible for producing a particular movement. The force for specific movement to any muscle is provided by agonists or prime mover. Thus, agonist is the muscle  that is primarily responsible for bringing about a particular movement.The synergists muscle helps the agonists or prime mover muscles. This muscle also stabilizes the joint at place of occurrence of movement. Thus, muscle aids another by promoting the same movement.

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