Across
- 4. Small tubes in the lungs
- 6. A waste product of cellular respiration
- 7. Release of energy from sugars
- 8. Narrow tubes leading to the lungs
- 10. The windpipe
Down
- 1. A cold, allergy, or asthma
- 2. Enables a high rate of gas exchange
- 3. Tissues that vibrate and make sound
- 5. Stability between working systems
- 9. Gas needed for cellular respiration