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Most cells are quite small. Limits on cell size are related to limits on the rate of movement of "good stuff in" and "bad stuff out" across cell membrances. Movement rates are greatly influecnced by the surface area-to-volume ratio

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The cell size ranges between 0.3 μm for the smallest and 100 μm for the largest. The lower limit of the sale given by the minimum volume necessary to house all the biochemical machinery that is essential to maintain the vital state. The upper limit is explained by understanding the extent to which the size of the affected cells increases the surface/volume ratio and the effectiveness of the exchange of substances with their environment, which is important for cell nutrition.

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