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There are two kinds of stem cells: Embryonic and adult.
1. Embryonic stem cells are found in embryos.
An embryo develops from a fertilized egg, or zygote, and after about 4-5 days it reaches the stage where 50-150 cells are colonized. This means that one fertilized egg divides into 50-150 cells, which are considered embryonic stem cells. Also, they are totipotent, meaning that they can reproduce indefinitely, and can give rise to any type of cell.
2. Adult stem cells, or somatic stem cells, can be found in adult tissues throughout the human body. As adult stem cells are tissue specific, they are in the already developed tissues.
Some examples of where you can find stem cells in the human body:
Bone marrow= hematopoietic (blood) stem cells which differentiate into blood cells
endothelial stem cells = diff. into blood vessels (arteries, veins)
mesenchymal stem cells = diff. into bone, cartilage, muscle, fat, fibres
Cord blood= blood stem cells (similarly to bone marrow)
(Because of this similarity they might be considered as an alternative for bone marrow
transplant.)
fat = adipose stem cells, also similar to bone marrow, as they can
differentiate into bone, cartilage, fat, and muscle.
Stem cells exist also in human skin, mammary glands, placenta, lungs, and the brain (in which neural stem cells may or may not exist; it is up for debate).
The main function of adult stem cells is to replace damaged, or dying cells. They are pluripotent. Therefore, they too can reproduce indefinitely. However, while embryonic stem cells are able to develop into any kind of cell, adult stem cells are more limited.
Umbilical cord blood considered to contain "adult" stem cells, since they are not part of the embryo anymore.
The use of embryonic stem cells for research purposes is a highly debated question. However, research done on using adult stem cells is more widely accepted. Adult stem cells, found in bone marrow and in umbilical cord blood, are used routinely today.
Fortunately, pluripotent (adult stem cells) can be "reprogrammed", and, as a result, they could be regarded as equivalent to embryonic stem cells.
Just for an interest: deciduous baby teeth (milk teeth, which babies shed) can also be used as a source for adult stem cells.
Stem cells, with the ability to develop into different cell types, can be found not only in humans, but also in plants and animals.
Wiki User
∙ 10y ago
Wiki User
∙ 11y agoThere are two kinds of stem cells: Embryonic and adult.
1. Embryonic stem cells are found in embryos.
An embryo develops from a fertilized egg, or zygote, and after about 4-5 days it reaches the stage where 50-150 cells are colonized. This means that one fertilized egg divides into 50-150 cells, which are considered embryonic stem cells. Also, they are omnipotent, meaning that they can reproduce indefinitely, and can give rise to any type of cell.
2. Adult stem cells, or somatic stem cells, can be found in adult tissues throughout the human body. As adult stem cells are tissue specific, they are in the already developed tissues.
Wiki User
∙ 12y agoStem cells are all over the body.
stem cells are not all over the body, hair for example is made of dead cells so you wouldn't find stem cells there. stem cells are mainly found in the blood of the umbilical cord of babies, the bone marrow, the tooth bud of the mandibular third molar and the skin.
Wiki User
∙ 14y agoThe bone marrow, blood, and umbilical cord... :)
Wiki User
∙ 14y agobone marrow, blood, and umbilical cord
Wiki User
∙ 11y agoall the body but mainly in the nose
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What is a small part of the human body?
The smallest parts of the human body are contained in the cells.
What type of human cells do not contain nuclei?
Red blood cells have no nucleus after they have fully developed. The nucleus is ejected so that there is more room for hemoglobin. That molecule is what carries oxygen.Because there is no nucleus the cell can not repair itself and will die in about 120 days. It's parts will then be recycled.
Does the human body contain all different types of cells?
Yes. The body has many types of cells. Here's some examples: Red Blood Cells White Blood Cells Plasma Cells
Which parts of the human body that contain nitrogen?
Most of the nitrogen in your body is contained within proteins and most of the protein in your body is contained within the muscles.
Which parts of the human body make leukocyte?
There are three parts of your body that produce leukocyte which are also known as white blood cells. They are: The spleen, the thymus and bone marrow.
Which human body parts don't contain DNA example do our skin and nail contain DNA?
Red blood cells
How many cells does the human body contain approximate?
The human body has an approximate number of ten trillion cells.
What is the characteristic number of chromosomes in human somatic cells?
In human, somatic cells are the cells that make up the body parts of an individual, other than the germ cells. They contain 46 chromosomes organized into 23 pairs.
What is a small part of the human body?
The smallest parts of the human body are contained in the cells.
How many cells does the human body contain?
The human body is composed of billions of cells. Each organ in the body is comprised of thousands of tissues, each of which are formed by thousands of cells.
How many chromosome's do human body cells contain?
21
Human body cells contain nuclei?
46 chromosomes
Which part of the body doesn't contain cells?
All parts of the body, as I know it are made of cells......... I could be wrong though.......
What must a human zygote contain for making different types of cells in the human body?
I think it's stem cells
Which cells in the human body contain the human gene?
ALL of them. They all contain the DNA and RNA needed for a human to develop and grow. A.K.A. the human gene.
What is the meaning cells?
cells are the building blocks of the human body if contain all the genetic information that needed to make a human being
Which cell contain 46 chromasomes?
All of them (in humans), apart from sperm and egg cells (which contain 23)
