Across
- 5. carry deoxygenated blood
- 6. tissue fluid consists mainly of ... and white blood cells
- 9. high carbon dioxide concentration ... the heart rate
- 11. condition where the heart is in short oxygen supply
- 14. component of blood
- 15. involved in blood clotting
- 16. blood clot
- 18. the scientist who demonstrated the one-way action of valves
- 19. heart valve
- 20. type of white blood cell
- 21. inorganic element in blood
Down
- 1. blood vessels assoicated with the kidney
- 2. left atrium receives blood from the ... vein
- 3. the circulatory system in humans
- 4. when heart is relaxed
- 6. controls heart beat
- 7. blood vessel carries blood away from the heart
- 8. circulatory system in fish
- 10. supply blood to the heart
- 12. measurement of heart activity
- 13. type of blood vessel
- 17. heart muscle