Which muscle assists by stabilising the agonist during a movement?

Which muscle assists by stabilising the agonist during a movement?

• A. agonist
• B. synergist
• C. fixator
• D. antagonist

Answer: (B)

Movement is most effective when the primary mover works with muscles that assist and stabilise the action. A synergist is the muscle that helps the agonist by stabilising the joint and adding force, so the main mover can perform the action smoothly and with better control. This stabilising support prevents unwanted movement at nearby joints and gives the agonist a stable base to work from, improving efficiency and precision. For example, in elbow flexion, the biceps acts as the prime mover, while muscles like the brachialis and brachioradialis assist and stabilise the elbow to help the curl. The antagonist would oppose the movement, and a fixator would hold a body part still to prevent unnecessary motion. So the muscle that assists by stabilising the agonist is the synergist.

Movement is most effective when the primary mover works with muscles that assist and stabilise the action. A synergist is the muscle that helps the agonist by stabilising the joint and adding force, so the main mover can perform the action smoothly and with better control. This stabilising support prevents unwanted movement at nearby joints and gives the agonist a stable base to work from, improving efficiency and precision. For example, in elbow flexion, the biceps acts as the prime mover, while muscles like the brachialis and brachioradialis assist and stabilise the elbow to help the curl. The antagonist would oppose the movement, and a fixator would hold a body part still to prevent unnecessary motion. So the muscle that assists by stabilising the agonist is the synergist.