Why the stem cell are call stem cell? Why stem?
Answers:
The definition for "stem" in the Merriam-Webster Online Dictionary say, (noun) "3 : a line of ancestry : STOCK; especially : a fundamental dash from which others have arisen" and "intransitive verb : to take place or develop as a consequence : have or trace an root <her success stems from not easy work>." "Stem" comes from: "Middle English, from Old English stefn, stemn stem of a plant or ship; akin to Old High German stam plant stem and probably to Greek stamnos wine jar"
The entry for "stem cell" states, (noun) "an unspecialized cell that gives rise to differentiated cell <hematopoietic stem cells surrounded by bone marrow>."
So, the differentiated (tissue) cells "stem" from stem cell.
brain stem.
Because differentiated (specialized) cells "stem" from them. Stem cell are cells that haven't nonetheless differentiated into specific body cells that will carry out a specific function.
A stem cell is a type of cell that has the means to either divide for indefinite period in culture to create more stem cell, or to give rise to specialized cell. Because of their ability to develop into any cell type, they could potentially provide an unlimited source of mature cells, such as bone, muscle, liver, or blood cell.
Several types of stem cells exist, which will be described within the context of human development. To vision a brief animation detailing the process of human development, click on “tutorial.”
After sperm fertilizes an egg, a zygote is formed which next has the potential to develop into a complete embryo. At this point, the fertilized egg is a totipotent stem cell, which routine that it has the potential to create any type of cell critical for embryonic development (this included extraembryonic membranes and tissues, the embryo itself, and adjectives postembryonic tissues and organs).
In the first few hours after fertilization, the fertilized egg undergoes several cell divisions that produce very totipotent cells. Because these cell are still totipotent, it means that any one of these cell has the potential to develop into an entire human self. In fact, similar twins are formed when two totipotent cells separate and develop into two genetically similar embryos.
The totipotent cells endure several rounds of cell division. Approximately four days after fertilization, they begin to specialize and form a blastocyst. A blastocyst is a orb of cells consisting of a hollow outer division of cells, in which is a cluster of cells phone call the inner cell mass.
The outer layer of cell will eventually form the placenta and other tissues that are needed for the support and development of the fetus. The inner cell mass will form adjectives of the tissues of the human body, therefore, these are the cell that develop into the fetus. These inner cell mass cells are pluripotent. This money that they are able to dispense rise to many, but not adjectives cell types necessary for fetal nouns (for example, they are able to make available rise to fetal tissues, but not placental tissue). It is this pluripotent stem cell that is currently underneath investigation for medical use.
The pluripotent cells after further specialize into another type of stem cell, a multipotent stem cell. Multipotent stem cells are committed to supply rise to cells that own a particular function, for example, blood stem cell give rise to red blood cell, white blood cells and platelets, and skin stem cell give rise to the different types of skin cell. Multipotent stem cells exist surrounded by both humans and adults, the best understood example person the blood stem cell. In every human being’s bone marrow, blood stem cells exist than constantly replenish the supply of red blood cell, white blood cells, and platelets.
Because they can grow to anything from nearby,well, anything not too specialized.
Think of stem as the start of things. Stem cell can produce any kind of cell (as per the definition). The stem of a plant is the start of everything that go after it.
Please see the webpages for more details on Stem cells and Stem cell research.
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