Human Organ System Crossword

12345678910111213141516171819202122232425
Across
  1. 2. Place where two bones meet
  2. 5. The gas that humans breathe out.
  3. 6. Bone that protects the brain
  4. 8. Muscle that pumps blood
  5. 9. The female reproductive cell.
  6. 10. The main organs used for breathing.
  7. 12. Blood vessels carrying blood away from heart
  8. 13. Muscles you control voluntarily
  9. 17. Tiny air sacs in the lungs where gas exchange occurs.
  10. 19. Tissue that connects bone to bone
  11. 21. The organ where a baby develops during pregnancy.
  12. 22. Blood vessels that carry blood back to the heart.
  13. 23. The liquid part of blood.
  14. 24. The male reproductive cell.
  15. 25. The tube that carries air from the throat to the lungs.
Down
  1. 1. Hard structure that supports the body
  2. 3. The male organs that produce sperm.
  3. 4. The tube that carries the egg from the ovary to the uterus.
  4. 7. The opening in the nose where air enters.
  5. 11. Muscles that move bones and help the body move
  6. 14. Muscles that work automatically in organs
  7. 15. Gas carried by red blood cells to body tissues.
  8. 16. Muscle that helps breathing
  9. 18. Organ that pumps blood
  10. 20. Longest bone in the human body