THE CIRCULATORY SYSTEM

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Across
  1. 2. Contraction of the heart
  2. 4. Process of digesting bacteria by a cell
  3. 6. Blood vessels that are deep seated
  4. 7. Helps in making a clot
  5. 8. Number of heartbeats per minute
  6. 11. Relaxation of the heart
  7. 12. Blood vessels that have valves
  8. 13. Organ than makes blood
  9. 15. Membrane that covers the heart
  10. 16. Thickening of the walls of the arteries
  11. 17. Artery that gives pure blood to the kidneys
  12. 18. WBC's involved in an immune response against virus
Down
  1. 1. Lower chamber of the heart
  2. 2. instrument that measures blood pressure
  3. 3. Ability to squeeze through walls of blood vessels
  4. 5. Artery that gives blood to the heart muscles
  5. 8. Delivers impure blood to the lungs
  6. 9. Another name for a pacemaker
  7. 10. Leukocytes that release histamine
  8. 14. Another name for platelets