The respiratory system

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Across
  1. 1. controls the volume of the chest
  2. 7. narrow tubes that carry air into a lung
  3. 8. this organ takes in air and filters it with tiny hairs.
  4. 9. the average number of breaths an adult takes per minute
  5. 10. takes air down to the lungs
  6. 12. the movement of a substance from where it is in high concentration to where it is in low concentration
  7. 14. move the chest during breathing
  8. 16. the release of energy from food in a cell
Down
  1. 2. tiny air sacs for gaseous exchange
  2. 3. another word for trachea
  3. 4. bones that protect the lungs
  4. 5. gaseous exchange
  5. 6. taking in oxygen for respiration and letting out carbon dioxide and water vapour from respiration.
  6. 7. a tube that carries air into the lung
  7. 11. A flap of skin that stops food going into the trachea.
  8. 13. A membrane that helps the lungs to move easily.
  9. 15. A gas that moves from the capillaries into the alveoli
  10. 17. A gas that moves from the alveoli to the capillaries