Human circulation

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Across
  1. 2. Part of the brain which brings about changes in heart rate through nerve impulses
  2. 4. Relaxation of the heart
  3. 7. Prevent back-flow of blood
  4. 8. Fragments of cells which allow blood clotting
  5. 10. Chambers in which blood is pumped out of the heart
  6. 12. DOUBLE allows the generation of a higher blood _________
  7. 15. Type of circulatory system e.g. humans. Heart -> Lungs -> Heart -> Body
  8. 16. Nerve which increases heart rate
  9. 17. These carry blood away from the heart
  10. 19. The side of the heart with the thickest muscle
  11. 20. Type of circulatory system e.g. fish. Heart -> Gills -> Body
  12. 21. Arteries and veins which which provide the heart with blood
  13. 22. Part of circulation where blood is pumped around the body
Down
  1. 1. Liquid part of blood
  2. 3. Hormone which initiates the 'fight or flight' response
  3. 5. Chambers in which blood first enters the heart
  4. 6. Small vessels which transport blood to the organs
  5. 8. Part of circulation where blood is pumped through the lungs
  6. 9. Contraction of the heart
  7. 11. The transport medium (substance)
  8. 13. The central cavity in blood vessels
  9. 14. Chemical found within erythrocytes
  10. 16. These carry blood to the heart
  11. 18. The pump