Across
- 1. humans have a ........... circulatory system
- 4. largest vein in the body
- 5. cavity in the middle of blood vessels
- 6. organs that lower water concentration of the blood
- 10. oxygen binds to this as it is pumped around the body
- 11. area inside of heart that blood enters first
- 14. oxygenate the blood
- 15. largest artery in the body
- 17. prevents back flow in blood vessels
- 18. produced by white blood cells to destroy microorganisms
- 19. fragments of other cells in the blood
Down
- 2. transported in the red blood cells
- 3. smallest blood vessel
- 5. cleans and filters the blood
- 7. liquid part of the blood
- 8. white blood cells which engulf bacteria and other microorganisms
- 9. artery that brings blood to the heart muscles
- 12. area of brain responsible for heart rate
- 13. organ responsible for pumping heart around the body
- 14. produce antibodies to destroy microorganisms
- 16. blood passes into this area of the heart, before being pumped into the veins