Respiratory System Vocabulary

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Across
  1. 4. If you know that "respiration" means "_____", then you can already guess what the respiratory system does
  2. 5. We breathe out _____ dioxide, and plants take it in
  3. 7. Plants release _____, and we breathe it in
  4. 9. Our _____ expand and contract like balloons as we breathe
  5. 10. To become small again after expanding
Down
  1. 1. The muscle that allows your lungs to expand and contract; it shrinks as your lungs grow and it grows as your lungs shrink
  2. 2. Little tubes in your lungs; Clue: Bronchitis
  3. 3. What scientists call your windpipe
  4. 6. To blow up like a balloon
  5. 8. Sacs inside the lungs that get oxygen and carbon dioxide to and from the blood as we breathe in and out