Biology question

Question

What kind of tissue is the source of the human embryonic stem cell?

a. placental

b. umbilical cord

c. early human embryos

d. brain tissue

e. nerve tissue

Answer 1

As the name suggests, embryonic stem cells come from embryos. Typically, this means an egg is fertilized in vitro (not in a living organism, like, in a lab), that has been donated with permission for use. Keep in mind that this is much, much earlier in the process than the development of an actual fetus, although it is still ethically controversial. The umbilical cord and placenta are certainly viable sources of stem cells, but like adult stem cells, are considered non-embryonic.