1. DIFFUSION OF GASES THROUGH THE DIFFUSION OF GASES THROUGH THE RESPIRATORY MEMBRANE EFFECT OF...

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Respiratory Unit. Figure shows the respiratory unit (also called “respiratory lobule”), which is composed of a respiratory bronchiole, alveolar ducts, atria, and alveoli. There are about 300 million alveoli in the two lungs, and each alveolus has an average diameter of about 0.2 millimeter. The alveolar walls are extremely thin, and between the alveoli is an almost solid network of interconnecting capillaries, Indeed, because of the extensiveness of the capillary plexus, the flow of blood in the alveolar wall has been described as a “sheet” of flowing blood. 3

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