The heart and Lungs

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Across
  1. 2. returns blood to the heart after it has been around the body
  2. 5. these make sure blood only flows in one direction
  3. 6. You have two of these that branch off from the trachea
  4. 8. takes blood from the heart to the lungs
  5. 9. Used for breathing
  6. 10. the bones that form a protective cage around the heart and lungs
  7. 12. The biggest blood vessel in the human body
  8. 13. The tiny air sacs where gas exchange takes place
  9. 16. makes up about 21% of the air you inhale
  10. 17. the chamber of the heart that the vena cava takes blood back to
Down
  1. 1. the chamber of the heart that has the thickest muscle.
  2. 3. The muscle that sits under your lungs
  3. 4. takes blood from the lungs back to the heart
  4. 7. The tough tissue that holds your windpipe's structure, also in joints
  5. 11. Makes up about 6% of the air you exhale
  6. 14. The correct scientific name for the windpipe
  7. 15. Pumps blood around your body