Biology Word Cross thingy

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Across
  1. 2. Keeps heartbeat regular
  2. 5. Allows blood in
  3. 6. Carry blood around the body
  4. 8. Prevents backflow of blood
  5. 10. Tiny exchange network
  6. 14. Four spaces for blood
  7. 16. Heart muscle contract
  8. 17. Bring blood to heart
  9. 19. Pushes blood outward
  10. 20. Carry blood from heart
Down
  1. 1. Cells that fight infection
  2. 3. Cells that help clot wounds
  3. 4. Starts the heartbeat signal
  4. 7. Liquid part of blood
  5. 9. Moves nutrients and gases
  6. 11. Travels through heart tissue
  7. 12. Cells carry oxygen
  8. 13. Impulse that triggers beats
  9. 15. Separate and protect sides
  10. 18. Heart muscle relaxes