Cardiovascular System

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Across
  1. 2. inner lining of the heart
  2. 4. the pericardial cavity contains this
  3. 6. about the size of the heart
  4. 7. sphygm/o
  5. 9. singular term for the 2 upper chambers
  6. 10. how oxygen poor blood enters the heart
  7. 12. there are this many types of blood vessels
  8. 13. plural of septum
  9. 14. The innermost layer of cells in arteries
  10. 15. These are only one cell in thickness
Down
  1. 1. this means wall
  2. 3. This valve has 3 cusps
  3. 5. is the thickest of all 4 heart chambers
  4. 8. how oxygen is brought back to the heart
  5. 11. This shuts to prevent aortic blood returning