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Fick's law and how lungs do them
Large surface area, more area to diffuse through alveoli
High concentration gradient constant blood supply keeps oxygen levels in blood at ventilation
sites low, and ventilation constantly keeps the oxygen tension of air high.
Small distance to diffuse across capillaries and alveoli are…

Page 2

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In inhalation, the diaphragm contracts (to straighten) and the intercostal muscles contract (to
move the ribcage upwards and outwards). This increases the volume inside the chest cavity,
and therefore decreases the pressure. The pressure inside the chest cavity is now less than that
of the air outside it, so the…


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