Why are cells so small?

Answer

Brooklyn College explains that cells are small because they must have a large surface area relative to the amount of volume they contain to function properly. As a sphere grows larger, its volume increases much more rapidly than its surface area does. This presents logistical problems for the cell, as it tries to transport resources and products through a large volume without the resources available via a large surface.

As an example, a typical animal cell requires oxygen to survive. The size of the cell partially dictates the amount of oxygen it needs, while the surface area of the cell limits the amount of oxygen that can be absorbed at a time. Accordingly, when the size of a cell grows, its demand for oxygen and other resources rises at a rapid rate, while its capacity for absorbing oxygen increases more slowly. At some point, the size of the cell will cause the cell to divide or die, according to Brooklyn College.

Despite the limitations on cell size that are imposed by the surface-to-volume ratio, a 2013 study published in the journal Nature Cell Biology demonstrates that gravity also limits cell size. While gravity is a negligible force at very small scales, cells that attain about 1 millimeter in diameter must include structural elements to keep some organelles stable under the influence of gravity. Without such elements, cell components can lose their structural integrity.

Q&A Related to "Why are cells so small?"
Cells are the building blocks of all organism. If they were too much bigger we would have a choppy pixelated appearance. Also cells are constantly dying and creating new cells.
http://www.ask.com/web-answers/Science/Biology/why...
cells are so small because they have so many different parts to it it needs to be small. a cell is made of of atoms and atoms are ity bity so if a cell is made up of only a few of
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Although it is generally the case that biological cells are too small to be seen without a
http://www.chacha.com/question/why-are-cells-so-sm...
This is to do with Fick's Law of Diffusion. Because oxygen and other substances must diffuse into the cell, if the distance they have to diffuse is too large, the cell cannot maintain
http://www.quora.com/Biology-1/Why-are-cells-so-sm...
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