Bones and muscles

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Across
  1. 2. Carry oxygen in the blood (3,5,5)
  2. 3. Spongy material in a joint (9)
  3. 6. The part of the bone that makes blood cells (4,6)
  4. 8. Provides support for all the organs and tissues in the human body (5)
  5. 9. The word that means muscles working in pairs (12)
  6. 11. Contracts to move bones (6)
  7. 12. Type of joint in elbow or knee
  8. 14. All the bones in the body (8)
  9. 15. When a muscle gets shorter (8)
  10. 17. Food needed to build healthy and strong muscles (7)
  11. 18. Springy material that makes bones more flexible (8)
  12. 21. The science name for a break in a bone (8)
  13. 22. Cancer of the bone marrow that causes too many white blood cells (9)
  14. 23. Bone in upper arm that's not funny! (7)
Down
  1. 1. Where two bones meet (5)
  2. 2. Protects lungs (3)
  3. 4. Attaches a bone to a bone (8)
  4. 5. Type of joint in neck (5)
  5. 6. Muscle that moves lower arm up (6)
  6. 7. Type of joint (4,3,6)
  7. 10. Joins a bone to a muscle (6)
  8. 13. When a muscle gets shorter (5)
  9. 16. Type of joint in skull bones (5)
  10. 18. Collar bone (8)
  11. 19. Longest bone in body (5)
  12. 20. Mineral needed for healthy bones (7)