The Circulatory System

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Across
  1. 3. smallest blood vessels connects arterioles and venules
  2. 6. red blood cells
  3. 9. cell fragment of blood involved in clotting
  4. 11. the cardiac muscle layer of the heart wall
  5. 12. minute artery
  6. 13. Liquid connective tissue
  7. 16. any substance that is recognized as foreign and activates the immune system
  8. 17. a small vein
  9. 18. the contraction phase of heart activity
  10. 19. a period of relaxation of the heart in which it fills with blood
  11. 22. the membranous sac enveloping the heart
  12. 23. the percentage of erythrocytes to total blood volume
  13. 25. a substance produced by the body that can provide immunity against a specific antigen
Down
  1. 1. Circulation system of blood vessels that carry blood to and from the lungs for gas exchange
  2. 2. white blood cells
  3. 4. a vessel that carries blood away from the heart
  4. 5. Circulation system of blood vessels that carry nutrient and oxygen rich blood to the body organs
  5. 7. the oxygen transporting pigment of erythrocytes
  6. 8. discharging chambers of the heart
  7. 10. a chamber of the heart receiving blood from the veins
  8. 14. the fluid portion of the blood
  9. 15. the membrane lining the interior of the heart
  10. 20. membrane that tightly hugs the outside of the heart and is actually part of the heart wall
  11. 21. a vessel that carries blood toward the heart
  12. 24. point at the bottom of the heart