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What are some examples for exocytosis?

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autumnhello | Student, Grade 9 | eNotes Newbie

Posted January 14, 2010 at 3:45 AM via web

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What are some examples for exocytosis?

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amarang9 | College Teacher | (Level 1) Educator Emeritus

Posted January 14, 2010 at 6:06 AM (Answer #1)

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Exocytosis is a process where cells can excrete digested material, but it's also a process where cells secrete other materials and can be a function of communication.

Some cells in the pancreas secrete (exocytosis) glucagen and insulin which regulate glucose levels. When glucose levels rise, beta-cells in the pancreas secrete the insulin.

Neurons send signals via neurotransmitters (in vesicles).

T-cells can send enzyme filled vesicles via exocytosis to prompt viral-infected cells to destroy themselves: a programmed cell death called exocytosis.

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versatilekamini | College Teacher | (Level 1) Valedictorian

Posted January 14, 2010 at 5:28 PM (Answer #2)

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Exocytosis is a process which is essentially the reverse of endocytosis. The membrane of a cell vesicle fuses with the plasma membrane and releases its contents outside the cell. Exocytosis serves as a means of extruding undigested material from the cell. It is also the principal mechanism by which hormones and other substances are secreted from the cell. Exocytosis is the durable process by which a cell directs the contents of secretory vesicles out of the cell membrane. These membrane-bound vesicles contain soluble proteins to be secreted to the extracellular environment.

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