Respiratory System

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Across
  1. 2. The thin double-layered membrane that wraps around each lung
  2. 4. A tiny branch of the airways that leads directly to the air sacs
  3. 5. The passageway in the back of your throat for both air and food
  4. 6. _______ dioxide is the waste gas you breathe out
  5. 7. The gas your body absorbs from the air to power your cells
  6. 10. The sticky fluid in your airways that traps dirt and germs
  7. 11. Tiny hair-like structures that sweep dust and debris out of the airways
  8. 12. The two tubes that split off from the windpipe into each lung
  9. 15. The structure in your throat that lets you speak and make sound
  10. 16. The flap that stops food from going down the wrong pipe
  11. 17. The tube that carries air from your throat down to your lungs
  12. 18. The act of drawing air into your lungs
Down
  1. 1. The slippery substance that keeps the tiny air sacs from sticking shut
  2. 3. The protein in red blood cells that carries oxygen through the body
  3. 5. A lung infection that fills the air sacs with fluid or pus
  4. 6. The smallest type of blood vessel, found wrapped around air sacs
  5. 8. The overall process of breathing and exchanging gases in the body
  6. 9. The large muscle below your lungs that moves when you breathe
  7. 13. Pushing air out of your lungs by relaxing the diaphragm
  8. 14. Tiny balloon-like sacs in the lungs where oxygen enters the blood