The Cardiovascular System

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Across
  1. 2. The higher vena cava
  2. 7. Substance recognized as foreign by the body
  3. 9. Filling the heart with blood
  4. 11. This system includes the blood, the blood vessels, which carry the blood
  5. 13. Endurance
  6. 15. An activity that helps maintain cardiovascular health
  7. 16. Blood circulating through the lungs
  8. 17. CO2, as an example
  9. 19. Clear white fluid made mostly from white blood cells
  10. 20. When the heart contracts
  11. 21. There are 8 different types of this
  12. 22. Nutrient that enters the blood
Down
  1. 1. A clear liquid that surrounds cells. Contains blood plasma
  2. 2. Blood circulating through the entire body
  3. 3. When white blood cells ingest and destroy certain micro-rganisms
  4. 4. The lower vena cava
  5. 5. The first chamber of the heart
  6. 6. You have white and red ones
  7. 7. The largest blood vessel in the body
  8. 8. The second chamber of the heart
  9. 10. They unite to form venules
  10. 11. A blood vessel with a small diameter
  11. 12. Substance secreted by blood cells to neutralize invaders
  12. 14. The main passageway for blood to your heart
  13. 18. You have at least 5L of it in your body
  14. 20. What happens when there is a blood clot in your heart