Endo- and exocytosis

Endo- and exocytosis

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Endo- and exocytosis

Endocytosis and exocytosis are widespread transport processes in eukaryotes, with the help of which larger quantities of particles can be brought into or out of cells.

In endocytosis, the particles to be ingested are flown around by extensions of the cell membrane and finally transported in the membrane-enclosed vesicles into the interior of the cell. A distinction is made between pinocytosis and phagocytosis. In pinocytosis (= cellular drinking) dissolved substances are taken up in relatively small vesicles from the environment, in phagocytosis (= cellular eating) larger, solid food particles or even whole cells are transported into large vesicles or vacuoles. The best studied form of pinocytosis is the so-called receptor-mediated endocytosis for the targeted uptake of certain macromolecules.

Exocytosis is practically the reverse of endocytosis. Here, material is excreted from cells by fusing intracellular vesicles with the cell membrane and emptying their contents.


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