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Flow diagram Assignment Question

Organise the ten events described in the list below into the correct order to construct a flow diagram of the stages in a normal inspiration of air into the lungs, followed by a normal expiration.

  1. Diaphragm and intercostal muscles relax.
  2. Stretch receptors in lungs send out action potentials.
  3. Air leaves the lungs.
  4. Respiratory centres in the brain send out action potentials.
  5. Air pressure in lungs increases.
  6. Air enters lungs.
  7. Diaphragm and intercostal muscles contract.
  8. Chest cavity increases in volume.
  9. Chest cavity reduces in volume.
  10. Air pressure inside lungs reduces.

Attempt:

  1. Diaphragm and intercostal muscles contract.
  2. Air pressure inside lungs reduces
  3. Air enters lungs.
  4. Chest cavity increases in volume
  5. Stretch receptors in lungs send out action potentials
  6. Respiratory centres in the brain send out action potentials
  7. Diaphragm and intercostal muscles relax.
  8. Air pressure in lungs increases.
  9. Air leaves the lungs
  10. Chest cavity reduces in volume.