Cardiovascular

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Across
  1. 3. specialized muscle fibers connecting the atria with the ventricles and transmitting electrical impulses between them
  2. 5. double-layered membrane surrounding the heart
  3. 6. inner lining of the heart
  4. 8. blood that is oxygen-poor
  5. 9. relation phase of the heartbeat
  6. 11. contraction phase of the heartbeat
  7. 12. located between the right atrium and the right ventricle
  8. 14. one of two pairs of vessels carrying oxygenated blood from the lungs to the left atrium of the heart
  9. 16. partition or wall dividing a cavity between the right and left aorta
Down
  1. 1. smallest type of blood vessel
  2. 2. blood vessels that branch from the aorta and carry oxygen-rich blood to the heart muscle
  3. 4. pacemaker of the heart
  4. 7. muscular middle layer of the heart
  5. 10. artery carrying oxygen-poor blood from the heart to the lungs
  6. 13. small artery
  7. 14. beat of the heart as felt through the walls of the arteries
  8. 15. abnormal swishing sound caused by improper closure of the heart valves