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