1.3 Limitations to Cell Size (SA:V ratio)

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5 Terms

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SA:V

SA- Total area of outer layer

V- Space occupied

Volume increases faster than surface area

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How it works

The smaller the cell, the higher the SA:V ratio

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Benefits

Higher SA:V ratio allows faster material exchange across the plasma membrane. Required substances come in, waste is removed

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Limitations

Decrease in SA:V ratio (increase in cell size) can slow material exchange, giving cells a size limit, as they must divide or die if the transfer cannot occur faster enough to sustain the cell.

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Compensation

Some cells compensate for the increased size by highly folding the SA