Across
- 2. muscle below the lungs
- 4. waste gas expelled you breathe out
- 7. small airway branches in the lungs
- 8. windpipe carrying air to the lungs
- 10. you breathe through it
- 11. small vessels connecting arteries and veins
Down
- 1. process of gases moving between lungs blood and tissues.
- 3. organs for breathing where oxygen enters and carbon dioxide leaves the blood.
- 5. gas we breathe in
- 6. tiny sacs in the lungs for gas exchange
- 7. tubes branching off the trachea
- 9. bony structures protecting the chest