Which technique harvests stem cells from human embryos?

Amniocentesis

Explanation: This is a medical procedure in which the pre natal diagnostic is done to known about the abnormalities in the child before its birth.

In this procedure the stem cells from the amniotic fluid is extracted without harming the fetus. The stems cells can be developed into skin, cartilage et cetera.

This is an ethical way to extract the amniotic fluid that contains stem cells in it.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;