The Lungs

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Across
  1. 2. The layer of muscle that separates our heart
  2. 5. The number of lungs a person is born with.
  3. 6. A part of the respiratory system.
  4. 8. What is the main organ of the respiratory
  5. 9. The colour of the lungs.
Down
  1. 1. The tube that joins our lungs to our mouth and
  2. 3. lung from the abdomen.
  3. 4. dioxide The air we exhale.
  4. 7. The air we inhale.