The lungs

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  • The lungs
    • Ventilating the lungs
      • What happens in the lungs when we inhale?
        • The intercostal muscles between the ribs and diaphragm contract
          • The volume of the thorax increases
            • The pressure in the thorax decreases and air is drawn in
        • The ribcage moves out and upwards and the diaphragm flattens
          • The volume of the thorax increases
            • The pressure in the thorax decreases and air is drawn in
      • What happens in the lungs when we exhale?
        • The intercostal muscles between the ribs and diaphragm relax
          • The volume of the thorax decreases
            • The pressure in the thorax increases and air is drawn out
    • Artificial breathing aids
      • The iron lung
        • A person would lie on their chest
          • The person would be sealed in a large metal cylinder
            • When air gets drawn out of the cylinder the person's chest would move out
              • The person would subsequently breathe in
                • The vacuum formed inside the cylinder would create a negative pressure
                  • When air gets pumped back in to the cylinder pressure would be created on the chest
                    • This would force air out of the person's lungs
      • Positive pressure aids
        • These force measured amounts of air into the lungs
        • They can be linked to computers for control
        • They are often smaller and easier to manage in the home

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