Question

multiple select question

select all that apply

a muscle that is acting as a synergist during a joint action may do which of the following?

stabilize a joint to restrict undesirable movements of a bone
relax to give the primer mover complete control over the action
modify the direction of the movement produced by the prime mover
contract together with the prime mover to produce more power

Explanation:

Define synergist muscle roles

Using the Muscle Functional Groups and Prime Mover knowledge points

• A synergist is a muscle that assists the prime mover (agonist) in performing a specific joint action.
• Synergists can contract simultaneously with the prime mover to add extra force or power to the movement.
• Synergists can stabilize intermediate joints to prevent unwanted, undesirable movements of a bone, allowing the force of the prime mover to be directed more efficiently.
• Synergists can modify the direction of a movement so that the prime mover's action is more precise.
• Synergists do not relax to give the prime mover complete control; rather, they actively contract to assist or modify the action.

Evaluate the given options

• Option 1: "Stabilize a joint to restrict undesirable movements of a bone" — This is a classic function of a synergist (often acting specifically as a fixator or stabilizer). This statement is correct.
• Option 2: "Relax to give the primer mover complete control over the action" — This is incorrect. Antagonists relax to allow movement, whereas synergists contract to assist.
• Option 3: "Modify the direction of the movement produced by the prime mover" — This is a correct function of a synergist, helping guide or fine-tune the path of movement.
• Option 4: "Contract together with the prime mover to produce more power" — This is correct, as synergists add force to the movement.

Answer:

• Stabilize a joint to restrict undesirable movements of a bone (Correct answer)
• Relax to give the primer mover complete control over the action
• Modify the direction of the movement produced by the prime mover (Correct answer)
• Contract together with the prime mover to produce more power (Correct answer)