The fetus has 3 blood vessels in the umbilical cord, 2 arteries (Rt/Lt), and 1 vein. Oxygenated blood goes into the superior vena cava into the liver and filters the mothers blood partially deoxygenating the blood and puts it back into the suerior vena cava.
Rt. Atrium->Rt. Ventricle->Pul. SL valve->Pulmonary Trunk (aortic arch)->Pulmonary artery->Lungs
6-8 weeks into developing a whole in the babies heart forms called the foramen ovale. After birth the hole closes becoming the Fossa Ovalis.
It's weird to think that a mothers blood becomes the babies. Everything between the two are shared it seems. A mothers nutrients goes to the baby but even blood is shared until birth. My mother always says that I will always be a part of her. This brings a whole new meaning to it.
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Christine,
ReplyDeleteI agree it is weird to think that the mothers blood becomes the babies. I like how you pointed out how the blood goes intot he liver and filters the mothers blood and then you mentioned where it goes back too.