You are observing a cell process in which small vesicles continually merge with the cell membrane....

You are observing a cell process in which small vesicles continually merge with the cell membrane. A number of different treatments known to influence the secretion of specific materials seems to have no effect on the process. What type of secretion appears to be occurring and why do different treatments have no effect on process?

Expert Solution

Exocytosis is the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell.

Exocytosis occurs when a cell produces substances for export, such as a protein, or when the cell is getting rid of a waste product or a toxin.

It is an active transport process that requires energy.

Exocytosis can be broadly classified in to two:
• Ca2+ triggered non-constitutive (regulated exocytosis)

Mainly requires an external signal, a specific sorting signal on the vesicles, as well as an increase in intracellular calcium.

• Non Ca2+ triggered constitutive exocytosis ( non regulated exocytosis)

Performed by all cells and serves the release of components of the extracellular matrix or delivery of newly synthesized membrane proteins that are incorporated in the plasma membrane after the fusion of the transport vesicle.

In "Constitutive exocytosis", the chemical messengers are constantly secreted, and the reactions that lead to exocytosis are not regulated by intracellular signals.

So no effect when treating with different substances.

gladiator answered 2 years ago

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