Across
- 2. breathing
- 3. windpipe
- 6. a hairline blood vessel
- 8. compartment, room
- 11. a branching vessel carrying blood from the body
- 12. relating to the lungs
- 13. pipe, cylinder, canal, passage
- 14. a heartbeat
Down
- 1. poisonous carbon and oxygen
- 4. blood circulation
- 5. a respiratory muscle
- 7. a vessel that carries blood from the heart
- 9. compress with the hand
- 10. a pair of breathing organs
- 14. push repeatedly