Across
- 2. a jelly liquid in a cell
- 3. wind pipe
- 4. it contains sap in a plant cell
- 6. major air passages of the lungs
- 8. breathing in and out
- 11. the organ that pumps blood
- 12. bulging air sacks
- 13. largest organ in the respiratory system
Down
- 1. where aerobic respiration happens in a cell
- 5. carry returns blood
- 7. muscle between the lungs and the abdomen
- 9. controls most cells
- 10. carries blood away