DO NOW

DO NOW

1. Turn in: Genetic Engineering Simulation, Get out Genetic Ethics HW.

2. What are some different types of cells within our body?? Think on this one.

3. What do you know about stem cells?

Stem Cells

What are stem cells?

Cells from which all other cells with

specialized functions are

generated

Review Cells: EukaryoticAnimal Cell Plant Cell

Red Blood Cells: Describe their shape

RBC Function

Transports oxygen throughout organisms. Shape allows for more surface area for oxygen attachment.

Common Object Most Similar To..

Oxygen Tank

Muscle Cells: Describe their shape

Muscle Cell Function

Stretches and contracts like a rubber band;

allows muscles to contract and

retract

Common Object Most Similar To..Rubber Band

Nerve Cells: Describe

their shape

Nerve Cell FunctionConducts messages throughout organisms

Common Object Most Similar To..

Telephone line

Sperm Cells: Describe their shape

Sperm Cell FunctionPossesses a tail; allows for movement to the egg

Common Object Most Similar To..

Motor boat

Specialized Cells

Differentiation: Stem cells develop into a specific type of cell in response to triggers (chemicals) from the body or the cell itself.

How are Stem Cells different?

Unspecialized cells that can constantly renew themselves through cell division

How are Stem Cells Different?

Can be induced (chemical signals) to become specialized cells with specific functions

Two types: Adult Stem Cells

Undifferentiated cell found in certain

tissues and organs; function is to

maintain and repair the tissue where they are found.

Adult Stem Cells

Two types: Embryonic Stem Cells

Undifferentiated cells found in embryos that developed from eggs that have been fertilized

artificially in a lab and then donated for research.

Embryonic Stem Cells

Adult Stem Cells vs. Embryonic Stem Cells

Embryonic stem cells have the ability to develop into almost every type of cell in the human bodyAdult stem cells may only develop into a limited

number of cell types.

Embryonic Stem Line

A group of constantly dividing stem cells; product of just one cell

Why do we care about Stem Cells?

Why do we care about stem cells?

Increase an understanding of how

diseases occur

if have “sick” cells, can watch them mature to

see what occurs.

Why do we care about stem cells?Generate healthy cells to replace diseased cells

Why do we care about stem cells?Test new drugs

Instead of testing on living organisms, tests can be performed on specific cells generated by stem cells

Stem Cell Controversy