Question on: JAMB Biology - 1999

• The image shows a diagram of a joint.
• Structure II in the diagram appears to represent the humerus (upper arm bone), and structure III represents the ulna (one of the forearm bones).
• The articulation between the humerus and the ulna forms a hinge joint, allowing movement in one plane (flexion and extension). This type of joint is similar to the hinge on a door.

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