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Intro to Anatomy 4: Cell Structure and Function
Intro to Anatomy 4: Cell Structure and Function
The Lone Ranger
Published by The Lone Ranger
01-07-2007
Default Vesicles


The Endomembrane System: Vesicles:
Vesicles are smaller membranous structures than are vacuoles, but they’re otherwise more or less identical. As mentioned earlier, vesicles are used to contain and transport substances within the cell.

Vesicles can be formed by endoplasmic reticulum or by Golgi bodies. Since the membrane surrounding a vesicle is the same substance that makes up the plasma membrane, if a vesicle should come into contact with the plasma membrane, the vesicle will be incorporated into the plasma membrane, and so its contents will be emptied to the outside of the cell. In this way, vesicles can be used to transport substances out of the cell.

Similarly, relatively small objects can be brought into a cell by vesicle formation. If the plasma membrane folds inward and pinches off, it will form a vesicle, and so substances can be transported into the cell from the outside. Once it forms, a vesicle can then transport the substance it contains to any other part of the cell, or it can fuse with a lysosome, so that the substance it contains is digested.

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