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.
The umbilical cord grows from the placenta to the babyâs navel. It allows blood to flow from mother to baby, and back again. The motherâs blood and the babyâs blood are filtered through the placenta, but they never actually mix. The placentaâs primary jobs are to: move oxygen into the babyâs bloodstream.