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 embryo and placenta grow side by side and are attached via the umbilical cord - the placenta attaches to the uterine wall as it develops after the embryo implants in the uâ¦terine lining. Some women have spotting and slight cramps when the embryo attaches to the uterine lining. 1 person found this useful.