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Answered 2007-02-04 12:23:46

There are many blood vessels on the surface of the uterus which 'feed' the placenta. In the umbilical cord there are usually two arteries and one vein, the arteries taking deoxygenated blood from the fetus to the placenta and one vein taking oxygentated blood fron the placenta to the fetus. Occasionally there nmay be only a single umbilical artery which may be a sign of a kideny malformation in the fetus.

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