Across
- 3. Two tubes that connect the trachea to the lungs.
- 5. dioxide, A gas that you breathe out. It is a waste gas.
- 8. Tiny sacs where gas exchange takes place.
- 9. exchange, The movement of carbon dioxide and oxygen between alveoli and capillaries.
- 10. Breathe out.
- 11. What we breathe.
Down
- 1. All animals need this gas to make food into energy.
- 2. Large muscle that controls the lungs.
- 4. scientific name for the windpipe or air tube.
- 6. One of two places where air enters your body
- 7. Breathe in.