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Gustatory sense receptors are clustered in structures called ?, They are found in elevations, called papillae on the surface of the tongue. These sense receptors are also made of separate cells, called gustatory cells.
In the lung, the epithelial cells at the ends of all the twigs form respiratory units, also called alveoli (singular, alveolus). (In a gland, the secretory units at the ends of the twigs are also sometimes called alveoli, which means a small hollow or cavity.)