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Cell Size Limitations
Why are cells so small?
 Most cells are
between 2µm and
 A micrometer is 1
millionth of a
 Too small to be
seen with naked
 Why can’t organisms be one big giant
 Diffusion limits cell size
 Movement from higher concentration to
lower concentration
 Larger the distance, slower the diffusion
 A cell 20 cm would require months for
nutrients to get to the center
 DNA limits cell
 larger cells need
more DNA. Needs
more of everything
 Most cells have just
one nucleus
Surface area to volume ratio limits size
 Volume increase more rapidly than
surface area.
 Cell size doubles, 8x as much volume,
but only 4x as much surface area
 So, if too big is a problem, what’s the
solution? Cells divide before they
become too big
 Process of cell division is called
Why do cells divide?
 Replacement
 Repair
 Growth