Science 8 Unit B Respiratory System Crossword Puzzle

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Across
  1. 3. The windpipe that connects the throat to the bronchi.
  2. 4. Dioxide The waste gas removed from the body when you breathe out.
  3. 8. Exchange The movement of oxygen and carbon dioxide between the lungs and blood.
  4. 9. The two main organs where gas exchange occurs.
  5. 10. The process of breathing air out of the lungs.
  6. 11. The large tubes that branch off from the trachea into each lung.
  7. 12. The tiny air sacs where gas exchange happens.
Down
  1. 1. Smaller branches that come off the bronchi.
  2. 2. The muscle under the lungs that helps you breathe.
  3. 5. The process of breathing air into the lungs.
  4. 6. The gas your body needs for cellular respiration.
  5. 7. The tiny blood vessels surrounding the alveoli.