Across
- 1. is a windpipe that carries oxygen to the lungs.
- 4. the organs that block dust particles.
- 6. the organ that can moves down when we inhale and moves up when we exhale.
Down
- 2. place where oxygen enters the blood and carbon dioxide leaves the blood.
- 3. are two tubes that branch from the trachea and carry air into the lungs.
- 5. the place where oxygen and carbon dioxide are exchanged.