Download Cell Division

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Specialized cells
In a single-celled organism, all the functions necessary for
life must be carried out in one cell. In contrast, multicellular
organisms can delegate jobs to particular groups of cells.
Cells that have adapted to a specific function are known as
specialized cells.
Specialized cells are grouped into tissues, which combine
to make organs and organ systems.
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Tissues, organs and organ systems
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Stem cells
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Rest phase
Cells often stop dividing once they are fully differentiated,
so where do they fit into the cell cycle?
Specialized cells move from
G1 into a resting phase
known as G0.
A cell may remain in G0
for the rest of its lifetime,
or it may just rest in this
state temporarily.
G0
G0 is also the phase in which stem cells wait until their
associated body cells need replacing.
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Plant structure
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Cell differentiation
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