biology stuff i need to do

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Across
  1. 4. Second part of the cardiac cycle
  2. 7. Heart beat cycle
  3. 11. Takes in oxygenated blood
  4. 13. Stronger ventricle that pumps blood around the body
  5. 16. Prevents blood backflow from ventricles to arteries
  6. 18. Platelets
  7. 21. Last part in the cardiac cycle
  8. 23. Muscle surrounding four heart chambers
  9. 25. White blood cells that help bacteria
Down
  1. 1. SA node responsible for speeding up the heartbeat
  2. 2. Watery yellow fluid responsible for transporting nutrients
  3. 3. Thin membrane
  4. 5. Pumps out deoxygenated blood
  5. 6. Prevents blood backflow from aorta to pulmonary artery
  6. 8. White blood cells
  7. 9. White blood cells that create antibodies
  8. 10. Takes in deoxygenated blood
  9. 12. Releases oxygenated blood
  10. 14. Helps pump blood in and out of heart
  11. 15. Exchanges substances between blood
  12. 17. Carry blood towards the heart
  13. 19. Sticky dark red fluid with salty flavour
  14. 20. Carry blood away from heart
  15. 22. First part of the cardiac cycle
  16. 24. Red blood cells