Definitions for exocytosis
ˌɛk soʊ saɪˈtoʊ sɪsex·o·cy·to·sis

WiktionaryRate this definition:0.0 / 0 votes

1. exocytosisnoun

   The secretion of substances through cellular membranes, either to excrete waste products or as a regulatory function

WikipediaRate this definition:0.0 / 0 votes

1. Exocytosis

   Exocytosis () is a form of active transport and bulk transport in which a cell transports molecules (e.g., neurotransmitters and proteins) out of the cell (exo- + cytosis). As an active transport mechanism, exocytosis requires the use of energy to transport material. Exocytosis and its counterpart, endocytosis, are used by all cells because most chemical substances important to them are large polar molecules that cannot pass through the hydrophobic portion of the cell membrane by passive means. Exocytosis is the process by which a large amount of molecules are released; thus it is a form of bulk transport. Exocytosis occurs via secretory portals at the cell plasma membrane called porosomes. Porosomes are permanent cup-shaped lipoprotein structure at the cell plasma membrane, where secretory vesicles transiently dock and fuse to release intra-vesicular contents from the cell. In exocytosis, membrane-bound secretory vesicles are carried to the cell membrane, where they dock and fuse at porosomes and their contents (i.e., water-soluble molecules) are secreted into the extracellular environment. This secretion is possible because the vesicle transiently fuses with the plasma membrane. In the context of neurotransmission, neurotransmitters are typically released from synaptic vesicles into the synaptic cleft via exocytosis; however, neurotransmitters can also be released via reverse transport through membrane transport proteins. Exocytosis is also a mechanism by which cells are able to insert membrane proteins (such as ion channels and cell surface receptors), lipids, and other components into the cell membrane. Vesicles containing these membrane components fully fuse with and become part of the outer cell membrane.

WikidataRate this definition:0.0 / 0 votes

1. Exocytosis

   Exocytosis is the durable, energy-using process by which a cell directs the contents of secretory vesicles out of the cell membrane and into the extracellular space. These membrane-bound vesicles contain soluble proteins to be secreted to the extracellular environment, as well as membrane proteins and lipids that are sent to become components of the cell membrane. However, the mechanism of the secretion of intra-vesicular contents out of the cell is very different from the incorporation of ion channels, signaling molecules, or receptors at the cell membrane. While for membrane recycling and the incorporation of ion channels, signaling molecules, or receptors at the cell membrane complete membrane merger is required, for cell secretion there is transient vesicle fusion with the cell membrane in a process called exocytosis, dumping its contents out of the cell's environment. Examination of cells following secretion using electron microscopy, demonstrate increased presence of partially empty vesicles following secretion. This suggested that during the secretory process, only a portion of the vesicular content is able to exit the cell. This could only be possible if the vesicle were to temporarily establish continuity with the cell plasma membrane, expel a portion of its contents, then detach, reseal, and withdraw into the cytosol. In this way, the secretory vesicle could be reused for subsequent rounds of exo-endocytosis, until completely empty of its contents.

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Exocytosis

   Cellular release of material within membrane-limited vesicles by fusion of the vesicles with the CELL MEMBRANE.

How to pronounce exocytosis?

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Numerology

1. Chaldean Numerology

   The numerical value of exocytosis in Chaldean Numerology is: 3

2. Pythagorean Numerology

   The numerical value of exocytosis in Pythagorean Numerology is: 1

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References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Exocytosis
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Exocytosis
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=exocytosis