Question
Bones are hard structures and cannot be bent. But, we can still bend our elbow, knee, etc. How is this possible?
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Answer
Elbow and knee are not made up of a single bone rather they are made up of two or more bones which are joined to each other by a joint, i.e. hinge joint. This joint along with the muscles help us to bend the elbow and knee. Hinge joint allows the movement of bones in only one direction.
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