The Human Body: Systems at Work

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