Stem Cell, Health Care Ethics Class
Stem cells are cells that can form into any type of cell, they are found in bone marrow, embryos, fetuses, and blood from the umbilical cord. Early in development, a human embryo is made up of a hollow ball of cells called a "blastocyst". Blastocyst cells divide and eventually develop into all of the tissues and organs of a human being, a process called "differentiation". Embryonic stem cells can be grown in the laboratory from blastocysts and made to differentiate into nerve, liver, muscle, blood, and other cells. Scientists hope to control the differentiation of the cells to replace cells in diseased organs in human beings. Embryonic stem cells can also be used to test the effects of new drugs without harming animals or people.
In adult human beings, stem cells are found in many places in the body, including the skin, liver, bone marrow, and muscles. In the organs, stem cells remain inactive until they are needed. The stem cells supply each organ with cells needed to replace......
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