If the question is read as an inquiry to the origin and the natural location of stem cells, then the answer would be that it comes from various tissues of the human body. Stem cells in an adult human being are found in the heart, blood, bone marrow, skeletal muscles, skin and fat as well. After a baby is born, the placenta and the umbilical cord are also found to be rich in stem cells. The placenta however, is much richer in stem cell count than the umbilical cord blood. Embryonic stem cells are among the first cells to develop because it is these that construct all the other tissues and thus the organs, bones, nerves and everything else in our body eventually, by converting into specifically functional cells.
The key factor about stem cells is that they are capable of constant rejuvenation through mitotic cell division and since they are not functional cells, they can transform into any specific type of functional cell, depending on the requirement of the body. Studies related to the possible uses of stem cells in various medical procedures is achieving greater importance with every passing year as scientists keep publishing journals on how the progress is going to improve treatment facilities dramatically. From the ability to repair almost any damaged organ to eliminating previously incurable diseases like cancer or Parkinson’s disease, it all seems to be in our reach in the near future. In order for the experiments to be successful, scientists must collect necessary amounts of stem cells from various sources. Embryonic stem cells are collected directly from the inside of the blastocyst, roughly a week or so after the egg cell is fertilized, and it is for that reason it is called unethical and have given rise to controversies regarding the extraction of embryonic stem cells. The germline tissues of the abandoned fetus are also a source of stem cell collection. Umbilical cord blood and placenta are the two other sources for collecting adult stem cells. Although not as pluripotent as the stem cells inside an embryo, the adult stem cells are also extracted by scientists from tissues and bone marrow of individuals for different purposes.