10.7 Crossword Puzzle Challenge

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Across
  1. 3. Gas that enters the blood through the lungs and travels to the heart to be pumped via arteries to all body cells
  2. 4. Waste-filled blood then flows back to the heart in small venules, which combine to form larger vessels.
  3. 7. Innermost lining of blood vessels.
  4. 11. abnormal heart rhythms
  5. 12. Double-layered membrane surrounding the heart.
  6. 14. One of two upper chambers of the heart.
  7. 15. Inner lining of the heart.
Down
  1. 1. large blood vessels that carry blood away from the heart
  2. 2. Beat of the heart is felt through the walls of the arteries.
  3. 5. Largest artery in the body.
  4. 6. (widened blood vessel)
  5. 8. Muscular middle layer of the heart.
  6. 9. Smallest type of blood vessel.
  7. 10. Contraction phase of the heartbeat.
  8. 13. Abnormal swishing sound caused by improper closure of the heart valves