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.
Cord entanglement in identical twins who share the same sac (monoamniotic twins) The umbilical cords run from each baby to the placenta, on the wall of the uterus. They feed nutrients, oxygen and blood flow between the babies and the mother.