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 an organ attached to the lining of your womb during pregnancy. It keeps your unborn babyâs blood supply separate from your own blood supply, as well as providing a link between the two. The link enables the placenta to carry out functions that your unborn baby canât perform for itself.