The Respiratory System

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Across
  1. 3. expand and contract with breathing
  2. 4. respiratory waste product
  3. 5. oxygen is swapped for carbon dioxide in the alveoli
  4. 7. Takes in oxygen and expels carbon dioxide
  5. 9. small blood vessels surrounding alveoli
  6. 10. small tubes that branch off from the trachea
Down
  1. 1. smallest forms of the bronchi in the lungs
  2. 2. comes from the air, combines with nutrients
  3. 6. tiny air sacs; there are 600 million in our bodies!
  4. 8. long tube that carries air to and from the lungs