How do we get bigger and bigger? (3)

Since all materials needed for the cell to carry out its activity must cross the surface membrane, the surface area of the cell will ultimately limit how much it can absorb.  Some cells overcome this size restriction either by altering their shape to an elongated form, like a nerve cell, or to a flattened shape, like a skin cell or by using hair-like projections to increase absorption the way an intestinal cell does.

These adaptations enable a cell to increase its surface area without increasing its volume.

Amazing isn’t it?


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