648594
Descrição
Mapa Mental por livmills97, atualizado more than 1 year ago
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Criado por livmills97
mais de 10 anos atrás
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Stem Cells
- After fertilisation, cell division
takes place and a hollow ball of
cells called an embryo is formed.
- The cells on the inside of
an embryo are called
embryonic stem cells.
- They are unspecialised (not designed
for a particular job). As the embryo
develops the cells begin to differentiate
and change into different types of cell.
- As the cells mature, they can no
longer differentiate but some of our
stem cells remain into adulthood.
- For example, there are adult
stem cells in our bone marrow
which give rise to new blood cells.
- Small numbers of stem
cells remain in other
body tissues as well.
- If stem cells can be made to
multiply and differentiate, we
would have an unlimited
supply of different types of
cells, which could be
transplanted into people
whose tissues are damaged.
- This is called stem cell theory.
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