Blood, Blood Vessels and the Heart

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Across
  1. 3. Valve between the right atrium and right ventricle
  2. 6. Chemical messengers carried in the plasma
  3. 9. Lower chamber of the heart
  4. 14. Type of white blood cell that engulfs pathogens
  5. 15. Shape of red blood cells
  6. 16. Name of the blood vessel bringing deoxygenated blood to the heart
  7. 18. Ventricle with the thickest wall
  8. 19. Waste product carried in the plasma
  9. 20. Thickness of capillary walls
Down
  1. 1. Blood vessel with the thickest wall
  2. 2. Organelle missing in red blood cells
  3. 4. Number of chambers in the heart
  4. 5. Name of artery that carries blood from your heart to your lungs
  5. 7. Gas carried by red blood cells
  6. 8. Component of blood involved in blood clotting
  7. 10. Protein in red blood cells that combines reversibly with oxygen
  8. 11. Type of white blood cell that produce antibodies that respond to specific antigens on the surface of pathogens
  9. 12. Makes up 55% of blood
  10. 13. Prevent backflow in veins
  11. 17. Upper chamber of the heart