![]() ![]() For example a red blood cell contains hemoglobin that allows it to carry oxygen. They are unspecialized: Specialized cells have specific capabilities that allow them to perform certain tasks.Stem cells are self-sustaining by replicating themselves for a much longer period of time. They can continue to divide for long periods of time: Most cells such as skin cells cannot replicate themselves after a certain period of time.Stem Cells are different from other cells because: Prints & Photographs Division, Library of Congress. A scientist studies a beaker containing cell samples at the Gates Center for Regenerative Medicine, a series of laboratories working with stem-cell biology at the University of Colorado’s Anschutz Medical Campus in Denver. The embryo will be called a fetus after the eighth week until birth. For humans, the embryo is defined as the implantation of fertilized egg in the uterus through the eighth week of its development. *Embryo: the embryo of mammals is defined as the stage of organism between the first division of zygote and the time it becomes a fetus through further development. There are multipotent stem cells for all of the different types of tissue in the body. For example a blood stem cell (multipotent) can develop into a red blood cell, white blood cell or platelets (all specialized cells). Multipotent stem cells have the ability to develop specific types of cells (terminally differentiated cells). As the embryo grows these pluripotent cells develop into specialized, multipotent stem cells.The difference between totipotent and pluripotent cells is only that totipotent cells can give rise to both the placenta and the embryo. This ability to become any type of cell in the body is called pluripotent. The organism in a stage between zygote to fetus is called an embryo* and the cells are called embryonic stem cells.Īt this point embryonic stem cells have the ability to become a cell for any part of the body (nerve, muscle, blood, etc.). Inside the trophoblast is a group of cells called the inner cell mass. The blastocyst has an outer-layer of cells called the trophoblast, which will eventually form the protective placenta.The zygote repeats the process of mitosis for about 5 or 6 days creating a small ball of a few hundred cells called a blastocyst. These cells are called totipotent and have the ability to develop into a new organism. The zygote undergoes a process known as mitosis, in which it replicates its chromosomes (which carry each parent’s DNA) and then divides, resulting in two identical cells.Sperm fertilizes an egg and forms a single cell called a zygote.Stem cells have unique properties that other cells do not have.įirst, to understand what stem cells are, you need to understand how humans and other mammals develop: National Institute of General Medical Sciences, Image and Video Gallery. Photo courtesy of California Institute for Regenerative Medicine. Human ES cells differentiating into neurons. They are present both during embryonic development (embryonic stem cells) and in the adult body (adult stem cells). Stem cells are the cells that have an ability to become various types of cells.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |