First Sentence
Lung development can be subdivided into following five stages: 1) embryonic period: development of major airways, 2) pseudoglandular period: development of airways to terminal bronchioles, 3) canalicular period: development of the acinus and vascularization, 4) terminal sac (saccular) period: subdivision of saccules by secondary crests, and 5) alveolar period: the appearance of alveoli. Read the first page
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