The Circulatory System

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Across
  1. 3. mechanism to stop haemorrhage when it occurs
  2. 6. blood vessel with the thickest walls
  3. 8. type of blood cell involved in immune response
  4. 11. outer layer of blood vessels
  5. 13. number of chambers in bird and mammal hearts
  6. 15. contraction of the heart
  7. 16. type of signal that triggers cardiac contraction
  8. 17. the top of the heart
  9. 21. blood vessel with valves
  10. 23. redirects the impulse to the bundle of His
  11. 24. disorder of the heart characterised by abnormal sound of heartbeat
  12. 25. blood vessel with the thinnest walls
Down
  1. 1. the circuit that carries deoxygenated blood to the lungs
  2. 2. the circuit that carries oxygenated blood to the body
  3. 4. muscular layer of the heart
  4. 5. cells that create antibodies
  5. 7. relaxation of the heart
  6. 9. the largest artery in the body
  7. 10. waste product transported in the plasma
  8. 12. the bottom of the heart
  9. 14. valve found in the aorta and pulmonary artery
  10. 17. fluid transported by the vascular system
  11. 18. node that is also known as the natural pacemaker
  12. 19. specialised mechanoreceptors in the heart
  13. 20. fibres in the walls of the ventricles
  14. 22. shape of red blood cells