The Movement of the Forearm While Twisting a Doorknob Is

Question

The movement of the forearm while twisting a doorknob is
A) protraction and retraction.
B) abduction and adduction.
C) flexion and extension.
D) lateral rotation and medial rotation.
E) supination and pronation.

Accepted Answer

The movement of twisting a doorknob involves the rotation of the forearm around the axis of the ulna and radius bones. Supination involves the rotation of the forearm where the palm is turned upward, while pronation involves the rotation of the forearm where the palm is turned downward. The twisting motion involves both supination and pronation, making answer choice E, supination and pronation, the best choice.