NAEP Science Grade 12

Category - Biology

In the human skeleton, which of the following has a pivot joint?
  1. Shoulder
  2. Knee
  3. Elbow
  4. Finger
Explanation
Correct Response: C. A pivot joint is a type of synovial joint that includes two or more bones that are covered with slippery cartilage at each end. They have a cylindrical bone that rotates inside another bone, which forms a ring around it. With the elbow, the radius rotates around the ulna when the hand is turned inward or outward. The shoulder joint has a ball and socket joint (A) that has the most range of motion around its axis. The knee has a hinge joint (B) that allows movement in one direction or one plane, and the wrist has gliding joints (D) in which one bone glides over another for a limited range of motion
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