cell

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

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lohita
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Post by lohita » Wed Apr 27, 2005 9:33 pm

Why is cell always small? why doesn't it grow bigger? :?

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James
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Post by James » Wed Apr 27, 2005 9:44 pm

An excessively large cell would be inefficient in it's required functions, to prevent this, cells divide.

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Poison
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Post by Poison » Thu Apr 28, 2005 4:37 pm

The cell must have a proper volume-surface area ratio to provide optimum transport.
Note that volume increases like x^3 but surface area increases like x^2.
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Post by MrMistery » Thu Apr 28, 2005 5:30 pm

There are bigger cells out there you know: the cells of an orange, or better yet a muscular fibre can reach 20 cm and a neuron about 1 meter. The conclusion we draw from here is that each cell has an optimum size for it's function
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lohita
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Post by lohita » Fri Apr 29, 2005 9:51 pm

Thanks u guys :!:

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Post by sam-guy » Sat Apr 30, 2005 11:43 pm

Cells have evolved to be efficient at what they do, to do this, over time they have altered the size of their cell, shape, surface molecules, and transport systems. Unless there is a selection need for larger cells then they wont be produced.

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Post by EmmVeePee » Sun May 01, 2005 12:38 am

It's been said, but reworded, the cell can't diffuse enough nutrients to supply.the cell for survival because the surface area is so much less than the volume. A smaller cell has a surface area/volume ration that is closer to 1.
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Post by biostudent84 » Mon May 02, 2005 1:48 pm

MrMistery wrote:There are bigger cells out there you know: the cells of an orange, or better yet a muscular fibre can reach 20 cm and a neuron about 1 meter. The conclusion we draw from here is that each cell has an optimum size for it's function


Correct. But remember that the reason for these exceptions is that the benefit of a longer cell outweighs the drawbacks of inefficiency.

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