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.
In the womb, the umbilical cord is usually attached at the center of the babyâs side of the placenta, or afterbirth. The placenta is where your babyâs blood picks up oxygen and nutrients from your circulation, leaving behind her waste and carbon dioxide.