Which term best describes a muscle that stabilizes one part of the body while another part moves?

Which term best describes a muscle that stabilizes one part of the body while another part moves?

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

Answer: (A)

When a muscle stabilizes one part of the body so another part can move, it acts as a fixator (a stabilizer). Its job is to anchor a bone or body region to provide a steady base, allowing the primary movement to occur efficiently at a different joint. For example, during a curling motion, muscles around the shoulder girdle may hold the shoulder steady so the elbow can flex smoothly. A synergist helps the main mover by adding force or guiding the movement but isn’t primarily about stabilizing a region. The agonist is the main muscle producing the action, and the antagonist opposes that action.

When a muscle stabilizes one part of the body so another part can move, it acts as a fixator (a stabilizer). Its job is to anchor a bone or body region to provide a steady base, allowing the primary movement to occur efficiently at a different joint. For example, during a curling motion, muscles around the shoulder girdle may hold the shoulder steady so the elbow can flex smoothly. A synergist helps the main mover by adding force or guiding the movement but isn’t primarily about stabilizing a region. The agonist is the main muscle producing the action, and the antagonist opposes that action.