The Respiratory System

123456789101112
Across
  1. 4. Very tiny blood vessels
  2. 7. It is found at the end of the trachea
  3. 9. Air sacs that exchange oxygen
  4. 10. The net movement of anything
  5. 12. type of gas CO2
Down
  1. 1. Source of life
  2. 2. The bony framework
  3. 3. The pipe that sends air to the lungs
  4. 5. The organ that collects the air
  5. 6. Small air tubes
  6. 8. First part of respiration
  7. 11. The muscle that is responsible for inflating and deflating the lungs