Human Circulatory System

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Across
  1. 2. Open and close as blood pass
  2. 6. The bridge between the two blood vessels
  3. 8. Mostly liquid
  4. 10. A protein that bind oxygen
  5. 12. Receive blood
  6. 15. Kill microorganisms
  7. 17. Present abundantly in blood
  8. 18. Carry blood to the heart
Down
  1. 1. Prevent prolong bleeding
  2. 3. Pump blood
  3. 4. Movement of cardiac muscle to pump
  4. 5. Activity that increase heart rate significantly
  5. 7. Largest artery
  6. 8. Related to carrying blood to and from lungs
  7. 9. The way oxygen enters cell
  8. 11. Molecules released by WBC to kill bacteria
  9. 13. You can feel this when you touch your wrist
  10. 14. Center of the pulmonary system
  11. 16. Carry blood to the body