Cardiovascular System Puzzle

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Across
  1. 4. largest artery in the body
  2. 5. the flow of blood from body tissue to the heart and back to body tissue
  3. 7. they carry oxygenated blood from the lungs to the heart
  4. 9. doubled layered membrane surrounding the heart
  5. 11. heartbeat felt through arteries walls
  6. 12. lower chamber of the heart
  7. 13. blood that is oxygen-poor
  8. 14. large blood vessels
Down
  1. 1. they carry oxygen-poor blood from heart to lungs
  2. 2. Smallest type of blood vessel
  3. 3. innermost layer of epithelial cell
  4. 4. upper chamber of the heart
  5. 6. valve that lies between the left atrium and ventricle
  6. 8. small artery
  7. 10. Small vein
  8. 13. relaxation phase of hearbeat