Circulatory System Crossword

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Across
  1. 1. The action of the heart.
  2. 3. We have about 5 litres of this in our body.
  3. 4. These tubes carry blood with oxygen to our body.
  4. 5. We only change one thing in an experiment.
  5. 8. The tubes that carry blood around our body.
  6. 13. The organs that give oygenate our blood.
  7. 14. This is like a guess we make before an experiment.
Down
  1. 2. This tells us how fast our heart is beating.
  2. 6. The answers from our experiment.
  3. 7. Something we can do to increase our pulse rate.
  4. 9. Transported to our body by the blood.
  5. 10. These tubes carry blood back to the heart.
  6. 11. We write this after an experiment.
  7. 12. The organ that pumps the blood around the body.