The Respiratory System

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Across
  1. 3. The act of spreading or allowing to spread
  2. 4. A bone protects your internal organs
  3. 5. A large airway that leads from the trachea
  4. 6. Tiny blood vessels that transport blood
  5. 7. Without restriction or interference
  6. 8. A place that supplies the body with oxygen
  7. 11. Air sacs exchange oxygen with CO2 in blood
Down
  1. 1. Small air tubes connect bronchus to alveoli
  2. 2. It gives air to the lungs.
  3. 6. What you get out after breathing
  4. 9. What you breathe with
  5. 10. The principal muscle of respiration
  6. 12. What enters your body when you breathe