Stem Cells

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  • Created by: Solz
  • Created on: 20-02-14 17:07
FOR Edexcel SNAB spec: Flip for aim
Explain term stem cells ,pluri,toti and multipotency and discuss the way society uses science knowledge to make decisions.......
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Definition of STEM CELL
A cell that has the potential to develop into different types of cells.
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What is a Stem Cell
Stem cells are unspecialised cells that can develop into many different types of cells.
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Name the Process of cell specialisation
Differentiation
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Name the two types of Stem cells
Embryonic & Adult Stem Cells
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What does Potency Mean?
It is the POTENTIAL of a stem cells to differentiate into specialised cells.
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Name the three types of potency
Totipotency, Pluripotency & Multipotency
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What is MULTIpotency
This the ability of a stem cell to produce a number of different cells but is Limited in its ability to differentiate
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Pluripotency
The ability of a stem cell to produce all specialised cells in an organism BUT extra-embryonic cells
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Totipotency
The ability of a stem cell to produce all cell types
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How can Embryonic stem cells be Obtained
From Early embryos. Through IVF.Human Egg is Fetilised and develops into a Blastocyst.Then they are transferred into a culture medium where they are culture into Embryonic Stem Cells.
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What is a Blastocyst
It is a ferilised egg which consists of inner cell mass.And Can become placenta/embryo
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Are embryonic Stem cells Pluri,Multi Or Totipotent and Why?
Pluripotent because they have the ability to differentiate into almost every type of body cell.
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What type of potency do adult stem cells have ?
Multipotency
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WHere and How are Adult Stem Cells ( Somatic cells) Obtained?
From Body Tissue of an adult.E.g in the bone Marrow.A needle is inserted in to the centre of a bone and some bone marrow is removed.
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How much risk is involved in the operation and does it cause discomfort?
Invloves litte risk but can cause a lot of dicomfort
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What is the disadvantage with using adult stem cells
They arent flexible as they can only develop into a LIMITED range of cells.
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What is the advantage with embryonic stem cells
They can develop into all types of specialised cells
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State an arguement FOR the use of stem cells
Can save Lives.Improve quality of live by replacing damaged tissues in a range of diseases e.g. Parkinsons and Spinal Cord Injuries.
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Arguement AGAINST the use of stem cells
Life begins at conception- destroying viable embryo and a potential life. Scientists are "trying to play god"
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What the works of the Regulatory authorities involve ?
Setting up guideline/codes of practice-to make sure methods of extraction are followed. Monitoring centres of research to avoid unregulated research. Provide advice/info to the govt - help society understand whats involved and the importance.
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What are two main problems with stem cells
Rejection by immmune system of recipient. Controversial ethical issues.
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What is a solutions to rejection
Therapeutic Cloning, Using drugs to prevent the recipient from rejecting any transplanted organ.Tissue typing.
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What does Therapeutic Cloning involve?
A Diploid cell is removed from patient needing transplant. The nucleus from this would be fused with an ovum from which haploid nucleus had been removed . Cell divides, Blastocyst fromes.Stem cells are isolated.Obtain gentetically identical tisusue.
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Card 2

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Definition of STEM CELL

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A cell that has the potential to develop into different types of cells.

Card 3

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What is a Stem Cell

Back

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Card 4

Front

Name the Process of cell specialisation

Back

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Card 5

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Name the two types of Stem cells

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