Embryonic stem cells come from a blastocyst that is 4–5 days old. The blastocyst contains stem cells and will later implant in the womb. Embryonic stem cellsįrom the very earliest stage of pregnancy, after the sperm fertilizes the egg, an embryo forms.Īround 3–5 days after a sperm fertilizes an egg, the embryo takes the form of a blastocyst or ball of cells. However, some evidence now suggests that they can differentiate to become other cell types, as well. In the past, scientists believed adult stem cells could only differentiate based on their tissue of origin.
STEM CELL MEANING SKIN
This division and regeneration are how a skin wound heals, or how an organ such as the liver, for example, can repair itself after damage. This means they can generate various cell types from the originating organ or even regenerate the original organ, entirely. They can stay non-dividing and non-specific for years until the body summons them to repair or grow new tissue.Īdult stem cells can divide or self-renew indefinitely. However, stem cells can be difficult to find. Scientists have found stem cells in tissues, including: Stem cells are present inside different types of tissue. In some parts of the body, such as the gut and bone marrow, stem cells regularly divide to produce new body tissues for maintenance and repair. They remain in this state until the body needs them for a specific purpose, say, as skin or muscle cells.ĭay-to-day living means the body is constantly renewing its tissues. The cells are in a non-specific state, but they are more specialized than embryonic stem cells. The body can use these stem cells whenever it needs them.Īlso called tissue-specific or somatic stem cells, adult stem cells exist throughout the body from the time an embryo develops. Share on Pinterest Stem cells can turn into any type of cell before they become differentiated.Ī person’s body contains stem cells throughout their life.
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