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