Across
- 4. pumps blood to nearby lungs
- 7. cycle changes that occur in the heart during one heartbeat
- 9. carries blood towards the heart
- 13. ventricles and atria all relax
- 14. red blood cells
- 15. exchange of substances occurs between the blood in this and cells
- 16. white blood cells
- 17. strong muscular wall dividing the heart left and right
Down
- 1. when the ventricles contract simultaneously
- 2. thin membrane lines inside the heart
- 3. flaps that prevent backflow of blood
- 5. both atria are filled with blood and contract simultaneously
- 6. prevent backflow of blood from ventricles into atria
- 8. carries deoxygenated blood to the lungs
- 10. carries blood away from the heart
- 11. platelets
- 12. strong contraction to pump blood throughout the whole body