Alveolus with Circulation of the Respiratory System

This image illustrates the respiratory division of the respiratory system. The respiratory tubes, or bronchioles, end in minute alveoli, each of which is surrounded by an extensive capillary network. The alveoli, alveolar sac, pulmonary venuole and pulmonary arteriole, bronchiole, and the capillary network on surface of alveolus are represented.

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