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5 1501049/take Credit Card, Mortga... A Details & History -... Question 3 An When a Business Banking: B... Statements and Do... (prime mover/antagonist/fixator/synergists), is a muscle whose contraction is chiefly responsible for producing a particular movement. The biceps brachii muscle is an agonist that produces flexion at the elbow. Charles Schwab 05_skull skeletal_....docx 1.25 pts A(n) (prime mover/antagonist/fixator/synergists), are muscles whose actions oppose that of the agonist under consideration. The triceps brachii muscle is an agonist that extends the elbow. It is therefore an antagonist of the biceps brachii muscle, and the biceps brachii is an antagonist of the triceps brachii. Agonists and antagonists are functional opposites; if one produces flexion, the other will produce extension. When an agonist contracts to produce a particular movement, the corresponding antagonist will be stretched, but it will usually not relax completely. Instead, it will contract (eccentrically/isotonically), with the tension adjusted to control the speed of the movement and ensure its smoothness. You may find it easiest to learn about muscles in agonist/antagonist pairs such as (eversion-retraction / abductors- adductors /flexion-rotation) that act at a specific joint. (prime mover/antagonist/fixator/synergist) contracts, it helps a larger agonist work efficiently. Synergists may provide additional pull near the insertion or may stabilize the point of origin. Their importance in assisting a particular movement may change as the movement progresses. In many cases, they are most useful at the start, when the agonist is stretched and unable to develop maximum tension. For example, the latissimus dorsi muscle is a large trunk muscle that