Chapter 9 Crossword

12345678910111213141516171819202122232425262728
Across
  1. 2. External layer of heart covering
  2. 3. Iron
  3. 4. Lymphatic glandlike organ
  4. 5. Another term for thrombocytes
  5. 7. The sinoatrial node
  6. 9. Middle layer of heart covering
  7. 12. Heart valve with two flaps
  8. 16. Lower border of heart
  9. 17. Very small veins
  10. 19. Part of system circulation
  11. 21. Relaxation part of cardiac cycle
  12. 23. Basic blood circuit
  13. 26. Lower heart chambers
  14. 27. This valve separates right atrium and ventricle
  15. 28. Fluid carried by lymphatic system
Down
  1. 1. Innermost membrane covering heart
  2. 4. Relaxation part of cardiac cycle
  3. 6. Two blood types of cats
  4. 8. Small blood vessels
  5. 10. Right ventricle pumps blood to this organ
  6. 11. Upper border of heart
  7. 13. Number of heart wall layers
  8. 14. Three pairs of lymphoid tissue
  9. 15. Source of lymphocyte formation
  10. 16. Largest artery
  11. 18. Upper heart chambers
  12. 20. Heart muscle
  13. 22. Aortic branch called aortic _______
  14. 24. Major type of blood vessel
  15. 25. Segment of circulation