by specialization
This is called cell differentiation and it is driven by chemicals/chemical gradients in the blastula development stage of the embryo (the early stage of development when it is a hollow ball of cells). These chemicals have the effect of causing the cells in different areas of the ball to start doing different things from other areas. The DNA in all the cells is the same but different bits of DNA (genes) are used for making proteins/enzymes as the cells differentiate.
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Because it is believed that cells have the ability to turn off some genes and only use certain ones that are needed for the specific job that the cell is doing.
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While the DNA in one's cells may be the same, not all of the genes are active at the same time. Some genes code for proteins that regulate the expression of other genes, for example. In addition, internal conditions in the cells during development of the embryo may affect the order in which certain genes are expressed as well. This differential gene expression results in the diversity of tissues we see.
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The DNA in every cell in an organism, such as a person, is indeed the same. It is like an encyclopedia. But in every cell only some of the pages of the encyclopedia are open and being read.
Enough of that encyclopedia metaphor! We have about 20,000 genes, which determine how we turn out as we grow and develop, and as cells differentiate. Every one of these genes is represented in every cell - twice, in fact, as there is one copy of the gene from Mom and one from Dad.
But in every cell only some of the genes are active. For example, there are genes for making hair and fingernails. But those genes are not active in most cells, otherwise we would be sprouting hair all over the liver and nails from the tips of our noses.
When some genes are activated, and the cell as a result makes the proteins that they code for, we say that the genes are being expressed.
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Because the DNA is controlled in it's expression and in it's length of expression. In some cells some DNA is turned off while other DNA is turned on, so different protein products are developed and combined in different ways to make different cells
This is a very simplified explanation of cellular development.
When a new cell is forming, it goes through the process of cellular differentiation where it specializes into specific kind of cell (brain cell, skin cell, etc.). After this process the cell often joins a tissue (which is an agglomeration of many specialized cells).
by specialization
Impossible. Each cell is made for a specific function. Skin cells cannot go to the brain and brain cells cannot break through the skull, and surface its way up to the skin.
Cell's Do Not Automatically Become Other Cells. Special Cells Such As Brain Cells are Orginated like that from the begginning
BMP
Skin cells, brain cells, blood cells, etc.
No. the skin cells wouldn't be capable of producing other skin cells. No nuclei are found in the cells of the outermost layer of your skin. A company claims that its moisturizer can restore and rejuvenate these cells.
It all depends on which cells. Some are not replaced. These are mostly nerve cells such as found in the brain. Other cells constantly die and are shed and replaced from tissues below them. An example of this are your skin cells.
During embryonic development cells specialize to form tissues. Mitotic cell division is very important during body growth. After this time muscle tissue becomes amniotic.
Mainly your skin cells, and other cells of the integumary system.
Injuries in the brain do not heal because brain cells cannot grow back. On the other hand body cells (skin) do grow back.
Skin cells, brain cells, blood cells, etc.
the skin has the most cells
In humans, rapidly dividing cells, such as skin and gut divide as often as once per day. Other cells such as brain and nerve tissue divide rarely in an adult.
matrix cells
hi
Stem cells are undifferentiated, which means that they can become anything. A skin cell is only a skin cell, a nerve cell is only a nerve cell, and a skin cell can't do what a nerve cell does, or vice versa. But a stem cell can become either a skin cell or a nerve cell, or any other cell your body has.
yes
They have many that we have: skin cells, muscle cells, brain cells, nerve cells. and bone cells.
The neurons in the brain and else where do not normally regenerate. Skin cells do regenerate.
No. the skin cells wouldn't be capable of producing other skin cells. No nuclei are found in the cells of the outermost layer of your skin. A company claims that its moisturizer can restore and rejuvenate these cells.
they are unipotent