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stem cell & diff

QuestionAnswer
Specialised cell - type has modified structures to allow it to carry out a particula function Neuron, RBC, muscle cell Highly specialised cells are unable to divide
stem cell - type unspecialised cell that undergoes cell division and has the ability to produce different types of body cells
Proliferation - process process which cells replicate themselves over & over ( mitosis)
Differentiation - process process by which unspecialized cells develop the characteristics & the functions of a particular cell They become specialized
why result 1 stem cell & 4 new specialised cells Self renewal required to maintain a pool of stem cells. special cells cant reproduce specialised cells function body but die & cant replace themselves
How differentiate Differentiation is triggered by chemical signals in the microenvironment around a cell. These chemicals activate certain genes & cause gene expression of particular genes in each cell
stem cell classify Potency (potential of a stem cell) how many different types of cells the stem can differentiate into Source: where stem cells originate
Totipotent can become ANY cell of the body and the embryonic membranes that surround support & nourish it Cells of the embryo within the first couple of mitotic divisions after fertilization
Pluripotent have ability to form any cell of the body but NOT the embryonic membranes Inner cell mass
Multipotent have ability to form some cells of the body Develop into more than 1 type but not all types Blood stem cell in boe marrow can give rise to RBC WBC & platelets only Found in both embbyros & adults
Embryonic derived from embryos - then inner cell mass of the blastocyst Pluripotent
Adult (tissue or somatic) occur in ‘adult’ tissues such as bone marrow, muscles, brain, used to replace old cells • Multipotent
Cord blood come from umbilical cord blood & placental blood from new born babies - adult somatic • Multipotent
Created by: procrast
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