In the context of first-class levers, the agonist and antagonist muscle groups may contract simultaneously on either side of a joint axis.

Question

Quizplus · Accepted Answer

In first-class lever systems, agonist and antagonist muscles can indeed contract simultaneously to stabilize a joint or control the movement around the joint axis, as seen in the action of the triceps and biceps around the elbow joint during certain activities.

In the Context of First-Class Levers, the Agonist and Antagonist