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Cell Structures

Discussion of all aspects of cellular structure, physiology and communication.

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Postby Yasaman.herandy » Sat Sep 20, 2008 1:01 pm

cell can only grow to a certain size, because if it grows more than that, then the surface hadn't grown enough to be able to provide all the requirements of volume (Which has grown a lot)
& I don't believe that membrane strech when grow! it expands! the membrane is produced by rough & smooth endoplasmic reticulums.
I said the membrane can grow to a certain size to be able to provide the volume; we know that enzymes need a surface for their function, so...!
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Postby smellor » Sat Sep 27, 2008 9:40 pm

Well, the fact that the internal volume of a cell increases by the cube of the radius contributes to size limitations, since this is not in line with the increase in surface area, the larger the cell gets the more difficulty it will have obtaining enough nutrients. There are of course ways for cells to overcome this barrier, such as cytoplasmic streaming, infolding of the plasma membrane and the presence of vacuoles in the cell. The microvilli of the cells lining the gut is an example of a way to overcome this problem.
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