Respiratory system

1. The thin tissue barrier dividing your nostrils into left and right sides.
3. The voice box that contains your vocal cords.
6. The main windpipe that carries air into your chest.
8. The two large, main branches that split off from the windpipe into each lung.
9. The tiny, hair-like threads lining your airways that sweep away dust and mucus.
10. The sticky fluid made in your airways that traps dirt, germs, and dust.
12. Smaller branch tubes that split off inside the lungs, leading to the air sacs.
15. The large muscle under your lungs that flattens out when you breathe in.

2. The protective, slippery membrane wrapped around each lung.
4. Two openings in your nose that take in air.
5. The tiny, grape-like air sacs where oxygen enters your blood.
7. The flap that closes over your windpipe when you swallow.
11. The soft tissue hanging at the back of your throat that stops food from going up your nose.
13. The two main spongy organs in your chest used for breathing.
14. The scientific name for your throat.