The Heart (and other stuff)

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Across
  1. 4. A compound that can maintain a constant pH
  2. 5. Chambers located at the top of the heart
  3. 8. Specialised muscle fibres that conduct electrical impulses
  4. 10. The result of oxygen and haemoglobin
  5. 15. Prevents valves from turning inside out
  6. 17. A type of white blood cell activated as part of the immune system
  7. 18. Caused by restricted blood flow to the heart
  8. 19. The stage of the heart cycle in which heart muscle must contract to pump blood
  9. 20. red fluid that flows through our bodies
  10. 22. Red blood cells
Down
  1. 1. Inefficient pumping of the heart
  2. 2. Tissue that lines the inside of a blood vessel
  3. 3. An attraction
  4. 6. The patch of tissue that initiates the heart beat
  5. 7. The wall that separates the atria from the ventricles
  6. 8. The concentration of oxygen
  7. 9. Small air sacs in the lungs
  8. 11. The term that states that the heart can cause its own electrical impulses
  9. 12. The effect of carbon dioxide concentration on the affinity of haemoglobin for oxygen
  10. 13. A structural fibrous protein
  11. 14. Allows red blood cells to have a larger surface area
  12. 16. The sequence of events making up one heart beat
  13. 21. Oxyhaemoglobin must release oxygen for this to happen
  14. 23. This bathes the cells of individual tissues