Moving your head to indicate "yes" and then to indicate "no" would correspond to which two movements?

Question

Quizplus · Accepted Answer

Moving your head to indicate "yes" involves flexion, which is the movement of decreasing the angle between two body parts, in this case the neck and the head. Moving your head to indicate "no" involves rotation, which is the movement of a body part around its own axis, in this case the neck rotating the head from side to side. Contraction and relaxation, elevation and eversion, and supination and extension do not accurately describe the movements involved in nodding "yes" and shaking your head "no."

Moving Your Head to Indicate "Yes" and Then to Indicate