Figure 1810

Photomicrograph showing the respiratory portion of the bronchial tree. In this photomicrograph a terminal bronchiole (TB) is shown longitudinally sectioned as it branches into two respiratory bronchioles (RB). The terminal bronchiole is the most distal part of the conducting portion of the respiratory system and is not engaged in gas exchange. The respiratory bronchiole engages in gas exchange and is the beginning of the respiratory portion of the bronchial tree. Respiratory bronchioles give rise to alveolar ducts (AD), which are elongate airways that have almost no walls, only alveoli surrounding the duct space. Alveolar sacs (AS) are spaces at the termination of the alveolar ducts that, likewise, are surrounded by alveoli. X120.

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