Body systems

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Across
  1. 4. process of breathing out
  2. 7. form a clot to stop bleeding
  3. 9. two cavities inside the nose
  4. 10. protect the body against infections
  5. 12. transports nutrients and gases
Down
  1. 1. two branches of the trachea
  2. 2. transports nutrients, oxygen, and waste substances
  3. 3. process of breathing in
  4. 5. two sponge-like organs
  5. 6. pumps the blood around the body
  6. 8. tiny air sacs at the end of the bronchioles
  7. 11. tube made up of rings of cartilage