Gas exchange in the alveolus
External respiration is a result of partial pressure gradients, alveolar surface area, and ventilation and perfusion matching.
This illustration shows gas exchange in the alveolus. The drawing shows the blood stream wrapped around aveolus, with oxygen being delivered by the blood to the aveolus and carbon dioxide from the aveolus as the blood flows through it. This is external respiration, a result of partial pressure gradients, alveolar surface area, and ventilation and perfusion matching.
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