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JAMB Biology 1981 Question 20

Question 20

Support and Movement

Fig. 4: Human arm --- part of skeleton of human arm
The joint at Y in Fig. 4 is

Diagram for this question
  1. A.ball and socket
  2. B.hinge
  3. C.pivot
  4. D.rivet
  5. E.none of the above.
Show the answer and explanation

Answer: B (hinge)

Explanation

Y is the elbow, a hinge joint that moves in one plane.