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.
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 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.
Stem 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.
The bone marrow, blood, and umbilical cord... :)
bone marrow, blood, and umbilical cord
all the body but mainly in the nose
The smallest parts of the human body are contained in the cells.
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.
Yes. The body has many types of cells. Here's some examples: Red Blood Cells White Blood Cells Plasma Cells
Most of the nitrogen in your body is contained within proteins and most of the protein in your body is contained within the muscles.
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.
Red blood cells
The human body has an approximate number of ten trillion 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.
The smallest parts of the human body are contained in the cells.
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.
21
46 chromosomes
All parts of the body, as I know it are made of cells......... I could be wrong though.......
I think it's stem cells
ALL of them. They all contain the DNA and RNA needed for a human to develop and grow. A.K.A. the human gene.
cells are the building blocks of the human body if contain all the genetic information that needed to make a human being
All of them (in humans), apart from sperm and egg cells (which contain 23)