Human/Fetal Circulation

[EKdental09]

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Does anyone have any outlines or anything typed up following the pathway or important points of human circulation as well as the key ideas for fetal circulation?

 

[Chesnok]

Mother and a baby are connected 😉

 

[Contach]

Umbilical Vein and the Pulmonary Veins are the only oxygenated veins in the body. The umbilical artery takes deoxygenated blood from the fetus to the placenta.

Fetal Circulation is all about the abnormalities that try and shunt blood away from the lungs, and the liver.

Foramen Ovale is in between the Right and Left Atria. Because the lungs has high resistance due to capillaries of lungs being flooded and inability of the alveoli to open up. this causes high pressure in the right atrium, higher than the left atrium. (in the adult, the left atrium pressure is higher than the right) Thus the blood flows from right atrium to left atrium.. bypassing the right ventricle which would take the blood to the lungs. When you start breathing (ie you are born) the resistance of the lungs go down, and the pressure in the right atrium lowers and automatically closes because the left is exerting more pressure. It's a flap that only lets blood go one way.

Ductus Arteriosus is a duct for arteries. It connects the pulmonary arteries with the aorta. So blood going to the lungs gets shunted towards systemic circulation. Once again, the pressure in the pulmonary arteries is high and this will facilitate it going from pulmonary --> systemic. When you are born, this forms into some ligament or tissue and slowly disintegrates.

Ductus Venosus links the umbilical vein with the inferior vena cava. Thus shunting blood away from the liver. There is no need for the liver to process the blood as anything it gets has already been filtered by the mother's liver.

Crap.. there's one more...hrm. maybe not.. I can't think of it..

Fetal Hemoglobin binds O2 stronger than adult hemoglobin. This is important so the baby can strip the O2 off the mother's hemoglobin.


Can someone explain the placenta and the exchange of gases/wastes across it?
Also, any1 have any good mnemonics for remembering which parts of the amnion/fetus/placenta come from which part of the embryo?

 

[doc3232]

Umbilical Vein and the Pulmonary Veins are the only oxygenated veins in the body. The umbilical artery takes deoxygenated blood from the fetus to the placenta.

Fetal Circulation is all about the abnormalities that try and shunt blood away from the lungs, and the liver.

Foramen Ovale is in between the Right and Left Atria. Because the lungs has high resistance due to capillaries of lungs being flooded and inability of the alveoli to open up. this causes high pressure in the right atrium, higher than the left atrium. (in the adult, the left atrium pressure is higher than the right) Thus the blood flows from right atrium to left atrium.. bypassing the right ventricle which would take the blood to the lungs. When you start breathing (ie you are born) the resistance of the lungs go down, and the pressure in the right atrium lowers and automatically closes because the left is exerting more pressure. It's a flap that only lets blood go one way.

Ductus Arteriosus is a duct for arteries. It connects the pulmonary arteries with the aorta. So blood going to the lungs gets shunted towards systemic circulation. Once again, the pressure in the pulmonary arteries is high and this will facilitate it going from pulmonary --> systemic. When you are born, this forms into some ligament or tissue and slowly disintegrates.

Ductus Venosus links the umbilical vein with the inferior vena cava. Thus shunting blood away from the liver. There is no need for the liver to process the blood as anything it gets has already been filtered by the mother's liver.

Crap.. there's one more...hrm. maybe not.. I can't think of it..

Fetal Hemoglobin binds O2 stronger than adult hemoglobin. This is important so the baby can strip the O2 off the mother's hemoglobin.


Can someone explain the placenta and the exchange of gases/wastes across it?
Also, any1 have any good mnemonics for remembering which parts of the amnion/fetus/placenta come from which part of the embryo?

I think there is a membrane between fetal and maternal blood...that is how wastes are exchanged I think...then again, allantois has something to do with wastes (I know the allantois is how wastes are transported out of birds and reptiles)...