Circulation 1

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Across
  1. 2. The contraction phase of the heartbeat
  2. 6. The name of the circulation which supplies blood to all organs except the lungs
  3. 9. Main artery
  4. 11. Blood coming from the lungs flows into the left _________
  5. 13. The relaxation phase of the heartbeat
  6. 14. The node which acts as the heart's pacemaker
  7. 17. Hormone which speeds up the heart rate
  8. 18. Valves which close when the ventricles contract
  9. 19. The large muscular chambers which pump blood out of heart
  10. 20. Vessel that carries blood away from the heart
  11. 21. Another name for the bicuspid valve
Down
  1. 1. Description of tissue which allows arteries to stretch
  2. 3. The valve which stops blood flowing back into the right atrium
  3. 4. Type of muscle found in walls of arteries
  4. 5. The hepatic _______ vein carries digested food to liver
  5. 7. Nerves which speed up the heart rate
  6. 8. Thin layer of cells which allow chemicals to diffuse in and out of capillaries
  7. 10. Tiny vessels found in all tissues
  8. 12. Vessel with valves to stop backflow
  9. 15. The only artery which contains deoxygenated blood
  10. 16. Valves at the base of the arteries leading out of the heart