Mucus production and secretion are specialized functions of goblet cells. Their characteristic goblet, cup-like shape created by the mucin granules that fill the cytoplasm earned them their name.
The canaliculi grow when secreted juice fills them whenever the cell is vigorously secreting. These cells also include many of mitochondria, which supply the ATP energy needed for the secretion process. The macromolecules are given different chemical groups inside the Golgi body to guarantee that they travel to the right place. Each macromolecule that enters the Golgi body is given a address in this fashion. For instance, mucus is secreted by goblet cells, which line the intestine.
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