The term ONE END OF AN UMBILICAL CORD is referring to the placenta, which is an organ that develops in the uterus during pregnancy. It is a temporary organ that provides oxygen and nutrients to the fetus and removes waste products from the baby's blood. The umbilical cord is attached to the placenta and is the baby's lifeline to the mother. One end of the umbilical cord is connected to the placenta, while the other end is connected to the baby.