The skeletal muscle that flexes (bends) the forearm after pronation (palm down position as in a pull-up) is the brachialis. Its origin is the humerus, and the insertion is the upper front of the ulna. Identify the class of lever involved and explain why you made this choice.
What will be an ideal response?
Class III lever as the effort exerted by the muscle on its insertion (on the ulna) is between the fulcrum (elbow) and the majority of the load (the ulna and forearm).
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