Adult stem cell definition

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Stem cells are cells of the body somatic cells which can divide and become differentiated. When an organism grows, stem cells specialize, and take specific functions. For instance, mature tissues like skin , muscle , blood , bone , liver , nerves , all have different types of cells. Because stem cells are not yet differentiated, they can change to become some kind of specialized cells. Organisms also use stem cells to replace damaged cells. Stem cells are found in most, if not all, plants and animals.
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Stem Cells For Dummies Cheat Sheet

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What is a stem cell? | Facts |

Adult stem cells are undifferentiated cells , found throughout the body after development, that multiply by cell division to replenish dying cells and regenerate damaged tissues. Scientific interest in adult stem cells is centered on their ability to divide or self-renew indefinitely, and generate all the cell types of the organ from which they originate, potentially regenerating the entire organ from a few cells. They have mainly been studied in humans and model organisms such as mice and rats. To ensure self-renewal, stem cells undergo two types of cell division see Stem cell division and differentiation diagram. Symmetric division gives rise to two identical daughter stem cells, whereas asymmetric division produces one stem cell and one progenitor cell with limited self-renewal potential. Progenitors can go through several rounds of cell division before finally differentiating into a mature cell. It is believed that the molecular distinction between symmetric and asymmetric divisions lies in differential segregation of cell membrane proteins such as receptors and their associated proteins between the daughter cells.
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What is a stem cell?

The key difference between adult and embryonic stem cells is that adult stem cells are multipotent while embryonic stem cells are pluripotent. Stem cells are a category of cells with the ability to divide and develop into different types of cells in the body. They are distinguished from the normal cells since they divide and renew themselves over a longer period of time. Moreover, they are unspecialized cells with no specific cellular function in the body. They have the potential to differentiate and become specialized cells in the body such as brain cells, blood cells, and muscle cells.
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Stem cells are cells that can differentiate into other types of cells, and can also divide in self-renewal to produce more of the same type of stem cells. In mammals , there are two broad types of stem cells: embryonic stem cells , which are isolated from the inner cell mass of blastocysts in early embryonic development, and adult stem cells , which are found in various tissues of fully developed mammals. In adult organisms, stem cells and progenitor cells act as a repair system for the body, replenishing adult tissues. In a developing embryo , stem cells can differentiate into all the specialized cells—ectoderm, endoderm and mesoderm see induced pluripotent stem cells —but also maintain the normal turnover of regenerative organs, such as blood, skin, or intestinal tissues.
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