Across
- 2. When we ............, oxygen goes into our body.
- 5. The air will go through ..... to our lungs
- 7. The air will enter our body.through ...... first.
Down
- 1. When we breathe out, our lungs become.....
- 3. When we ............, carbon dioxide goes out of our body.
- 4. When we breathe in, our lungs become.....
- 6. The respiratory consists of nose, windpipe and two ....