Across
- 2. Does not have collagen fibres, smooth muscle and elastic fibres
- 7. Waste gas produced in muscles
- 9. Oxygen rich blood
- 13. Blood vessels that carry blood away from the heart
- 14. Bottom chambers of the heart
- 16. Organ where gas exchanged with environment
- 19. Heart does not require stimulus
- 20. Capillaries are blood vessels with lowest blood ?
- 21. Another word that means heart
Down
- 1. Blood vessels that swap oxygen and carbon dioxide
- 3. Top chambers of the heart
- 4. Carry oxygenated blood for the heart to use
- 5. Carbon dioxide rich blood
- 6. Controls contraction of heart
- 8. Heart rate is measured in beats per
- 10. Prevent backflow of blood through veins
- 11. Blood vessel that carries blood towards the heart
- 12. Veins have largest ? diameter
- 15. Blood flow around the body
- 17. Number of chambers in the heart
- 18. Your blood vessels could reach around this 2.5 times