biology

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Across
  1. 4. Single layer or flat cells lining blood vessels
  2. 7. Wall that divides heart
  3. 9. atrium Takes in oxygenated blood
  4. 12. Formation of white blood cells
  5. 13. Measures a fluid resistant to flow
  6. 15. Heart beat cycle
  7. 16. The volume of the air expired per breath
  8. 17. Artery narrowing conditions blood cells
  9. 18. Second part of the cardiac cycle
  10. 20. The nerve going to the diaphragm
Down
  1. 1. Formation of platelets
  2. 2. SA node responsible for speeding up the heart beat
  3. 3. the rise in the heart rate before exercise
  4. 5. vein Takes fresh blood from lungs to the heart
  5. 6. White blood cells that defends RBC
  6. 8. Smallest blood vessels
  7. 10. Double pump
  8. 11. Small veins that carry blood from capillaries to the heart
  9. 14. The name of the shift for oxygen dissociation
  10. 19. Immunity (produces antibodies)