Question

Give reasons
1)Our elbow couldn't move backward
2)We can only move our lower jaw

Answer 1

We didnt move our elbow backword because it has hing joint .Hing joint is the joint that allows movment only in one or single direction that is frount direction becase of these regions we can not move our elbow in frount direction only. We can only move one jaw while eating because the upper jaw is connected with the skull by an immovable joint while the lower jaw is connected by a movable joint which makes the movement possible.