Across
- 2. A tightening of a muscle
- 4. A gas essential for human life
- 6. The upper chamber of the heart
- 7. Liquid which carries white cells, red cells and platelets
- 9. Regular expansion and contraction of an artery
- 10. A substance that provides nourishment
- 11. Living things are made up of these
- 12. To carry from one place to another
- 14. Fight disease
- 18. Relating to the circulation of blood - to move around
- 19. A heavy gas - poisonous to humans
Down
- 1. The lower chamber of the heart
- 2. Thin blood vessels which connect veins and arteries to form a network throughout the body
- 3. A complete part that has a specific function
- 5. Unwanted remains
- 8. Carries blood away from the heart
- 9. Support clotting and stop bleeding
- 13. Carry oxygen
- 15. Made up of many interrelated parts
- 16. To die
- 17. Carry blood from the heart