BIOLOGY EXOCYTOSIS

May 20th, 2015
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Exocytosis is a cellular process where cells eject waste products or chemical transmitters (such as hormones) from the interior of the cell. Exocytosis is similar in function to endocytosis but working in the opposite direction.

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EXOCYTOSISDEFINITION : Exocytosis is a cellular process where cells eject waste products or chemical transmitters (such as hormones) from the interior of the cell. Exocytosis is similar in function to endocytosis but working in the opposite direction. PROCESS:a) Vesicle TraffickingIn this first step, the vesicle containing the waste product is transported through the cytoplasm towards the part of the cell from which it will be eliminated.b) Vesicle TetheringAs the vesicle approaches the cell membrane, it is secured and pulled towards the part of the cell from which it will be eliminated.c) Vesicle DockingIn this step, the vesicle comes in contact with the cell membrane, where it begins to chemical and physically merges with the proteins in the cell membrane.d) Vesicle PrimingIn those cells where chemical transmitters are being released, this step involves the chemical preparations for the last step of exocytosis.e) Vesicle FusionIn this last step, the proteins forming the walls of the vesicle merge with the cell membrane and breach, pushing the vesicle contents (waste products or chemical transmitters) out of the cell. This step is the primary mechanism for the increase in size of the cell's plasma membrane.ENDOCYTOSISDEFINITION: The transfer of materials from the extracellular into intracellular is called endocytosis.TYPES:a) PHAGOCYTOSISThe process where the solid particles engulfed by extended Pseudopo

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