OKWARA HEART PUZZLE

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Across
  1. 1. One of two lower chambers of the heart.
  2. 3. in only one direction.
  3. 4. Small vein.
  4. 6. small artery.
  5. 10. Muscular middle layer of the heart.
  6. 13. closes an opening so that blood
  7. 14. Double-layered membrane surrounding the
  8. 15. of the arteries.
  9. 17. Largest type of blood vessel.
Down
  1. 2. Innermost lining of blood vessels.
  2. 5. Inner lining of the heart.
  3. 7. Largest artery in the body.
  4. 8. Beat of the heart as felt through the
  5. 9. Contraction phase of the heartbeat.
  6. 11. One of two upper chambers of the heart.
  7. 12. Smallest type of blood vessel.
  8. 16. Structure in veins or in the heart that