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BIOLOGY EXOCYTOSIS

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Biology
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EXOCYTOSIS
DEFINITION : 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 Trafficking
In 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 Tethering
As 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 Docking
In 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 Priming
In those cells where chemical transmitters are being released, this step involves the
chemical preparations for the last step of exocytosis.
e) Vesicle Fusion
In 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.

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EXOCYTOSIS DEFINITION : 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 Trafficking In 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 Tethering As 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 Docking In 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 Priming In those cells where chemical transmitters are being released, this step involves the chemical preparations for the last step of exocytosis. e) Vesicle Fusion In 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. ENDOCYTOSIS DEFINITION : The transfer of materials from the extracellular into intracellular is called endocytosis. TYPES: a) PHAGOCYTOSIS The process where the solid particles engulfed by extended Pseudopo ...
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