StemCellResearch1-EvaAchim - Pre AP Biology 5th Period Eva Achim Fact finder 1 What is the definition of a stem cell a A stem cell is an unspecialized

StemCellResearch1-EvaAchim - Pre AP Biology 5th Period Eva...

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Pre AP Biology5th PeriodEva AchimFact finder1.What is the definition of a stem cell?a)A stem cell is an unspecialized that gives rise to differentiated cells <hematopoietic stem cells in bone marrow>.Source: b) The stem cell is one of the human body's master cells, with the ability to grow into any one of the body's more than 200 cell types. Stem cells are unspecialized (undifferentiated) cells that are characteristically of the same family type (lineage). They retain the ability to divide throughout life and give rise to cells that can become highly specialized and take the place of cells that die or are lost. Stem cells contribute to the body's ability to renew and repair its tissues. Unlike mature cells, stem cells can both renew themselves and create new cells of whatever tissue they belong to (and other tissues). Bone marrow stem cells, for example, are the most primitive cells in the marrow. From them all the various types of blood cells are descended. Bone marrow stem cell transfusions (or transplants) were originally givento replace various types of blood cells.Source: 2. What are the differences between an adult stem cell and an embryonic stem cell?Both embryonic and adult stem cells have advantages and disadvantages regarding their possible use in regenerative therapies.A major difference between embryonic and adult stem cells is their distinct and various abilities in the number and type of diverse cells they can become.Embryonic stem cells can transform into all kind of body cells because they are pluripotent, whereas adult stem cells are thought to be limited to individualizing cell types of their tissue of origin.Embryonic stem cells can be easily grown in culture, while adult stem cells are rare in mature tissues.It is believed that tissues derived from embryonic and adult stem cells can differ in the presumption of being rejected after transplantation.Adult stem cells are less likely to cause rejection when transplanted. The use adult stem cells and tissues from the patient’s own adult stem cells are less expected to be rejected by the immune system.Source:
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3. What is a blastocyst?“The blastocyst is a structure formed in the early development of mammals. It possesses an inner cell mass(ICM) which subsequently forms the embryo. The outer layer of the blastocyst consists of cells collectively called the trophoblast. This layer surrounds the inner cell mass and a fluid-filled cavity known as the blastocoele.The trophoblast gives rise to the placenta. The name "blastocyst" arises from the Greekβλαστός blastos("a sprout") and κύστις kystis(<bladder, capsule>).”Source:
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  • Spring '17
  • Starr, Brand
  • Biology, Cellular differentiation, Embryonic stem cells

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