Science stuff

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Across
  1. 3. the liquid that the other components of blood are suspended in
  2. 5. the valve that leads to the aorta
  3. 9. where gas exchange occurs
  4. 14. white blood cells that digest pathogens
  5. 15. the valve between the right atrium and ventricle
  6. 16. the number of lines of defense in the immune system
  7. 18. blood vessels that only fit one cell
  8. 19. blood vessels with pocket valves
Down
  1. 1. the valve that leads to the pulmonary artery
  2. 2. pathogens that reproduce rapidly and release toxins
  3. 4. white blood cells that produce antibodies
  4. 5. blood vessels with thick walls
  5. 6. whtie blood cells that clean up infected cells
  6. 7. help blood to clot
  7. 8. when the diaphragm contracts and the pressure decreases
  8. 10. when the diaphraghm relaxes and the pressure increases
  9. 11. the valve between the left atrium and ventricle
  10. 12. pathogens that aren't living
  11. 13. the main organ of the respiratory system
  12. 17. the main muscle of the circulatory system