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The histology of alveolar ducts is primarily characterized by the presence of elastin and collagen within their structural components. These proteins are crucial for the resilience and elasticity of the lung tissue, allowing alveolar ducts to maintain their shape during the respiratory cycle. The multiple layers of elastin provide the necessary flexibility, which facilitates the expansion and contraction of the alveolar ducts during inhalation and exhalation. Collagen, on the other hand, contributes to the structural integrity and tensile strength of the lung tissue, ensuring that the alveolar architecture remains intact while allowing the necessary gas exchange to occur.

In contrast, goblet cells, ciliated cells, and Clara cells are primarily associated with other parts of the respiratory system, such as the bronchial tree. Goblet cells are mucus-secreting cells found in the larger airways that help trap airborne particles and pathogens. Ciliated cells line the respiratory epithelium and are involved in the movement of mucus towards the pharynx, assisting in keeping the airways clear. Clara cells, found in the bronchioles, have various functions including detoxifying harmful substances and secreting components of the surfactant but are not significant contributors to the histology of the alveolar ducts.

Thus,