If you lay your forearm along the table,you can rotate it so that your hand changes from a palm- down to a palm- up position.This is possible because your radius and ulna join at a

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A pivot joint allows for rotational movement, which is what is occurring when rotating your forearm from a palm-down to a palm-up position. The radius rotates around the ulna at the pivot joint.

If You Lay Your Forearm Along the Table,you Can Rotate