The Heart (and other stuff)

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