Circulatory System

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Across
  1. 3. Name of the pacemaker. (3 words)
  2. 6. Connects the small intestine and the liver. (Three words)
  3. 7. Carries blood away from the heart.
  4. 8. Scientific name for red blood cells.
  5. 11. Another name for the right atrioventricular valve.
  6. 12. Liquid component of blood.
  7. 13. Type of circulatory system in fish.
  8. 16. Wave of depolarisation causing ventricular contraction.
  9. 17. Prevent atrioventricular valves from opening the wrong way.
  10. 19. Valves that prevents blood flowing back into the ventricles.
  11. 22. Layer of blood vessels containing muscle and elastic tissue. (Two words)
Down
  1. 1. Type of circulatory system in insects.
  2. 2. When heart muscle relaxes.
  3. 4. Layer of blood vessels containing lots of strong collagen. (Two words)
  4. 5. Location of the bundle of His.
  5. 9. Artery that supplies the kidneys.
  6. 10. Layer of blood vessels containing endothelium. (Two words)
  7. 14. Fibres that carry electrical impulses up the walls of the ventricles.
  8. 15. Respiratory pigment found in red blood cells.
  9. 18. Name of cycle of events in a heart beat.
  10. 20. Carries blood into the heart.
  11. 21. Measures electrical impulses that control heart rate.