Question

Why we can move our arms in circular motion but not our knees?

Answer 1

Answer:

We can move our arms in circular motion but not our elbow because the joints at the elbow are the ball and the socket joint whereas the joints that are present in our elbow is the hinge joint. The ball and the socket joints can be rotated to 360 degree.

Answer 2

Explanation:

We can move our arms in a circular motion because our shoulder contain ball and schoket joint .while instead of this our knees contain hing joint.