How do cells become specialized to form the different organs in the body?
Human development begins when a sperm cell fuses with an egg cell. This initial fertilized egg, although it is only a single cell, is able to form an entire human being. This cell starts to divide into additional cells, which at this early stage are all able to produce a complete organism. These cells are therefore called totipotent, meaning they have total potential to produce all cell types present in a living human. As development proceeds and an embryo forms, these cells become pluripotent, meaning they have potential to become many different kinds of cells but can no longer give rise to a complete embryo. Later in development, through a process called cell differentiation, these pluripotent cells eventually give rise to the different and more specialized kinds of cells in the body and the different organs begin to form. What are stem cells? Stem cells are cells that have not gone through the process of cell differentiation and therefore have the potential to give rise to many diff
