The difference in the action when comparing the biceps brachii to the flexor carpi radialis, is
A) one muscle flexes the hand at the wrist and the other flexes the entire forearm.
B) one muscle flexes the arm and the other extends the arm.
C) one moves the ulna and the other moves the radius.
D) one of these muscles is voluntary while the other is involuntary.
E) the shapes of the two muscles differ.

Question

Quizplus · Accepted Answer

The biceps brachii muscle flexes the forearm at the elbow joint, while the flexor carpi radialis muscle flexes the hand at the wrist joint. Therefore, the difference in their actions is that one muscle flexes the entire forearm while the other flexes only the hand at the wrist.

The Difference in the Action When Comparing the Biceps Brachii