Question

When the arm is bent at the elbow, the biceps brachii acts as the ____.

(A) Synergist
(B) Fixator
(C) Antagonist
(D) Prime mover

Answer 1

Answer:

During forearm flexion (bending the elbow), such as lifting a cup, a muscle called the biceps brachii is actually the prime mover; however, because it can be assisted by the brachialis, the brachialis is called a synergist in this action (Figure 10.2. 1)