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Biology AS doubts

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VIP_93:
i have a couple of questions guys and would be really grateful if some1 answered

First what are pinocytic vesicles and how are they formed?

Second, when the RER releases shuttle vesicles, those vesicles are made of the RER's membrane, so doesn't the membrane of the RER finishes? or nothing happends to the membrane as its fluid-like?

Thanks in advance.

mousa:
pinocytic vesicles...is derived form the term , pinocytosis , which itself is a type of endocytosis. the other type is phagocytosis.
pinocytosis invovles the bulk uptake of liquids form the surrounding enviroment of a cell, hence this might include dissolved ions or nutreints....the process starts like this.. nutreints approach the plasma membrane , penetrate through it, a vesicle forms around it and pinches off the memrane.. this action requires energy. This vesicel is known as the pinocytic vesicle....it moves on to internal regions of the cell, where the nutreints diffuse out of the vesicel and get utilized by the it... pinocytosis is also known as cell drinking  :P.

2. i guess the membrane keeps on reforming as vesicles pinches off....

hope i helped

VIP_93:
Thanks mousa....really helpful :)

mousa:

--- Quote from: VIP_93 on November 01, 2009, 09:15:22 am ---Thanks mousa....really helpful :)

--- End quote ---

welcome. glad that i helped.. :)

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