Across
- 2. where oxygen is taken into and carbon dioxide is expelled out
- 5. they bring air into the nose, where air is warmed and humidified
- 6. known as the windpipe
Down
- 1. tiny sac in the lungs,and gaseous exchange takes place
- 3. two air tubes that bring air directly into the lungs
- 4. when we breathe it contracts and flattens out and pulls downward