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What is a stem cell?
1) self-renewing population of unspecified cells
2) divide to give rise to differented cell types
Terminally Differentitated means?
cell serves a specific function only and will never reproduce, so it will die when it's done
What tells the stem cells what to do and when to turn on?
signals and cues
Stems cells are near the (blank) and will migrate upward
Embryonic stem cells can give rise to all the tissues and cells types of the body
Cell + special factor = could make it work
1) Transplant cells that have been grown in culture (donor)
2) stimulate stem cells of teh patient called (en...) to regenerate damaged tissue
What are the two types of stem cells?
Embryonic and Adult
Name three things about Embryonic
: before becomes a fetus
undifferentiated cell that have the potential to become any specialized cell type
immortal in culture
: can be anything
Negatives about Embryonic stem cells
Not well understood
not "self", subject to rejection
hard to control
What are adult stem cells?
get the stem cells from the body
partially specialized arleady
signals required for differentiation may be simplier
should not be attacked by the immune system
Adult Stem Cells negatives
al in culture
t ; can only be so many things
difficult to obtain (brain)
rarer in old people
cannot cure genetic diease
Stem Cells Cancer