Thanks to the hormone called estrogen, the fluid is maintained to keep the lining of the vagina healthy and elastic. Whenever a woman experiences a drop in estrogen levels, the amount of moisture available is also reduced. Vaginal dryness is the result, which thins out the lining and creates a less elastic environment.
Medical Definition of umbilical cord. : a cord arising from the navel that connects the fetus with the placenta and contains the two umbilical arteries and the umbilical vein.
The umbilical cord is made up of: 1  one vein that carries blood rich in oxygen and nutrients from you to your baby.  two arteries that return deoxygenated blood and waste products, such as carbon dioxide, from your baby back to the placenta.