Looks like you clickedhttps://books.google.com.au/books?id=0TbJjd9eTp0C&pg=PA117&lpg=PA117&dq=what+protects+the+lungs+from+injury&source=bl&ots=52m_OQ44IY&sig=sRomWr1fc6o_Ce2wAyMPadUzndw&hl=en&sa=X&ei=T0cPVda6AtG78gXrvYCwBA&ved=0CDEQ6AEwBTgU#v=onepage&q=what%20protects%20the%20lungs%20from%20injury&f=false
If you do not want to visit that page, you can close this browser tab.
