The pulmonary lobule (or secondary lobule) is composed of several acini, each with a bronchiolo-arterial bundle and its alveoli. Here, parts of 2 acini with their bronchiolo-arterial bundles are shown. The lobules are separated by interlobular septa, which contain the pulmonary veins. The larger spaces in the alveolar parenchyma represent alveolar ducts.
Find the interlobular septum.
Find two bronchiolo-arterial bundles.
Find an alveolar duct in the right quarter of the image.
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