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Arm Muscles Flexion: Agonist, Antagonist, and Synergists

Learn about the arm muscles involved in flexion, including the roles of agonist, antagonist, and synergist muscles. Understand the origin and insertion points of muscles during movement.

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Arm Muscles Flexion: Agonist, Antagonist, and Synergists

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  1. MusclesAdvanced Information More Able Pupils

  2. Flexion (Bending) of the Arm • The muscle doing the work (contracting) and creating the movement is called the agonist or primemover. • The muscle which is relaxing and letting the movement take place is called the antagonist. Antagonist (Triceps relax) Agonist or Prime Mover (Biceps contract) • Other muscles support the prime mover (agonist) in creating movement and these are called synergists.

  3. The Origin and Insertion • When a muscle contracts, only one bone moves leaving the other stationary. The points at which the tendons are attached to the bone are known as the origin and the insertion. • The origin is where the tendon of the muscle joins the stationary bone(s). • The insertion is where the tendon of the muscle joins the moving bone(s). Origin The arm is being flexed. Insertion The radius and ulna are the moving bones. The humerus and scapula are stationary bones.

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