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 placenta is the membrane that connects the fetus with the dam. The button like structures of the placenta (cotyledons), connect with the caruncles of the uterus. It is through these unions (placentomas), that nutrients are transferred from the mother to the calf.