One of the most remarkable examples of cell communication is the fight or flight response. body handle extraordinary situations. responses involved in the fight or flight response. place in the movie. 0:16 An environmental signal travels into the brain. a nerve impulse to the hypothalamus (not shown).
Umbilical cord. In placental mammals, the umbilical cord (also called the navel string, birth cord or funiculus umbilicalis) is a conduit between the developing embryo or fetus and the placenta.
Medicine and Healthcare. The umbilical cord and the placenta are both made at once and it is the embryos cells that make the placenta and umbilical cord. When the fertilized zygote reach the uterus about 5-6 days after fertilisation the cells of the zygote will start to turn into different parts.