The respiratory system

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Across
  1. 3. the gas we need to transfer to cells for respiration
  2. 5. the tube connecting the nose and mouth to the lungs
  3. 6. the scientific word for breathing out
  4. 7. a sponge like organ responsible for gas exchange
  5. 8. the gas we need to get rid of from the body
  6. 11. these are made of bone and protect the heart and lungs
  7. 12. the scientific word for breathing in
  8. 13. the flat sheet of muscle that separates the chest from the lower part of the thorax
Down
  1. 1. the small tubes within the lungs that end in tiny air sacs
  2. 2. this and the mouth are where air enters and leaves the body
  3. 4. the two tubes that split from the trachea and join it to each lung
  4. 9. the tiny air sacs where gas exchange happens in the lungs
  5. 10. these muscles move the ribs