ventilation- the lungs

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  • Created by: siobhan
  • Created on: 04-05-13 14:32
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  • Ventilating the lungs
    • the lungs are situated in the thorax, inside the rib cage and above the diaphragm, which separates the lungs from the abdomen
    • breathing in
      • the intercostal muscle between the ribs and the diaphragm contract
      • the volume of the thorax increases
      • the pressure in the thorax decrease and air is drawn in
      • the ribages moves up and out and the diaphragm flattens
    • breathing out
      • the intercostal muscle between the ribs and the diaphragm relax
      • the ribcage moves down and in and the diaphragm becomes domed
      • the volume of the thorax decreases
      • the pressure increases and air is forced out
    • the movement of air in and out of the lungs is known as ventilation

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