2007-12-05 02:56:03 · 16 answers · asked by Anonymous in Science & Mathematics ➔ Biology
embryonic tissue are the most totipotent cells. I dont agree to human cloning though....
2007-12-05 03:00:18 · answer #1 · answered by BitterSwt 2 · 0⤊ 0⤋
Okay. This is a biggie. In the human body there are two types of stem cells.
1.) Adult stem cells
These cells are found all around the body. However, they can only turn into certain types of cells.
For example, in bone marrow, there are stem cells called "hematopoietic" stem cells - they can only turn into certain types of blood cells. I.E. white blood cells, red blood cells, platelets, and other blood factors.
Another area is the Amygdala - a part of the brain that deals with memory. There are stem cells there, too, but for neural development.
So, there are certain types of stem cells in certain types of areas.
2.) Embryonic Stem Cells
These are the cool stem cells. When you were born, you started off from one cell - an embryonic stem cell. That cell can turn into ANY type of cell. It's like a blank slate that's waiting for instructions to become other cells. Scientists call this attribute "pluripotency" - the adult stem cells before have "multipotency" ~ they can change but not into anything. The problem is, is that in humans this type of stem cell doesn't stay around when you grow older.
So to answer your question, adult stem cells are all over the human body. They are there, but there aren't too many of them. If you want to look for them, it's like trying to find a needle in a haystack - it's really really hard. A human body has around 50 trillion body cells (this varies from person to person), and stem cells only compose a small fraction of those cells. But to sum it up, depending what stem cell you're looking for, you'd find the stem cell in different parts of the body.
Hope this helped! =)
2007-12-06 06:31:47 · answer #2 · answered by Prodon 2 · 1⤊ 0⤋
in the bone marrow they are present as pleuripotent hematopoietic stem cell... it forms all the elements of blood under the influence of certain proteins that the body makes.
stem cells can be isolated from the pulsating umbilical cord as soon as the baby is Born and the cord is clamped and cut.
2007-12-05 03:56:41 · answer #3 · answered by Geek Goddess 3 · 0⤊ 0⤋
Bone Marrow. I used to work for a research firm that did stem cell research.
2007-12-05 02:59:10 · answer #4 · answered by Anonymous · 1⤊ 0⤋
arent stem cells found in the umbilical cord when a child is born?
2007-12-05 02:59:03 · answer #5 · answered by Sam R 3 · 0⤊ 0⤋
The stem of the brain. At the base of your head/start of your neck.
2007-12-05 02:59:48 · answer #6 · answered by cfisher4234 3 · 0⤊ 0⤋
They are cells found in all multi-cellular organisms whether embryonic (stem cells that are found in blastocysts) or adult stem cells (found in adult tissues).
2007-12-05 03:01:57 · answer #7 · answered by Gani F 2 · 1⤊ 0⤋
stem cells are found in embryonic tissue which are the most totipotent cells.
2007-12-05 03:11:36 · answer #8 · answered by Anonymous · 0⤊ 0⤋
I believe they are found in the skin cells. somewhere.. not sure.. Just caught the tell end of an announcement.
2007-12-05 02:59:41 · answer #9 · answered by LeChara Johnson 3 · 1⤊ 0⤋
um its not. only in fetuses. stem cells are blank cells waiting for assignment.
2007-12-05 02:59:14 · answer #10 · answered by Anonymous · 1⤊ 1⤋