Mechanics of breathing

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Across
  1. 3. These detect a chemical change in the blood
  2. 6. The size of the thoracic cavity ......... during expiration
  3. 9. These are the intercostal muscles that contract to pull the ribs down
  4. 11. The part of our brain responsible for controlling breathing
  5. 12. Our diaphragm and external intercostal contract when the receive one of these from the DRG.
  6. 15. These intercostal muscles are only used during exercise.
  7. 17. This area of the medulla oblongata is only activated during exercise and it makes the internal intercostals and the abdominals contract
  8. 18. The tiny passages leading to the alveoli
Down
  1. 1. The diaphragm does this when it contracts during inspiration
  2. 2. This is the shape of the diaphragm when it is relaxed
  3. 4. Air passes through here after the nose.
  4. 5. Cavity The space in our chest where our lungs are
  5. 7. These are the intercostal muscles that contract to lift the ribs
  6. 8. Another name for our windpipe
  7. 10. Tiny air sacs in the lungs where gaseous exchange occurs.
  8. 13. The process in which energy is made
  9. 14. The pressure inside the thoracic cavity ......... during expiration
  10. 16. These extra muscles help to pull the ribs down during exercise