Where does the umbilical vein enter the circulation of the fetus?
Blood from the placenta is carried to the fetus by the umbilical vein. In humans, less than a third of this enters the fetal "ductus venosus" and is carried to the inferior vena cava, while the rest enters the liver proper from the inferior border of the liver. The branch of the umbilical vein that supplies the right lobe of the liver first joins with the portal vein. The blood then moves to the right atrium of the heart. In the fetus, there is an opening between the right and left atrium (the "foramen ovale"), and most of the blood flows through this hole directly into the left atrium from the right atrium, thus bypassing pulmonary circulation. The continuation of this blood flow is into the left ventricle, and from there it is pumped through the aorta into the body. Some of the blood moves from the aorta through the internal iliac arteries to the umbilical arteries, and re-enters the placenta, where carbon dioxide and other waste products from the fetus are taken up and enter the maternal circulation.
Where does less than a third of the blood from the umbilical vein enter the circulation of the fetus?
Ductus venosus ductus venosus and is carried to the inferior vena cava
Fetal circulation
Blood from the placenta is carried to the fetus by the umbilical vein. In humans, less than a third of this enters the fetal "ductus venosus" and is carried to the inferior vena cava, while the rest enters the liver proper from the inferior border of the liver. The branch of the umbilical vein that supplies the right lobe of the liver first joins with the portal vein. The blood then moves to the right atrium of the heart. In the fetus, there is an opening between the right and left atrium (the "foramen ovale"), and most of the blood flows through this hole directly into the left atrium from the right atrium, thus bypassing pulmonary circulation. The continuation of this blood flow is into the left ventricle, and from there it is pumped through the aorta into the body. Some of the blood moves from the aorta through the internal iliac arteries to the umbilical arteries, and re-enters the placenta, where carbon dioxide and other waste products from the fetus are taken up and enter the maternal circulation.
Where does more than two thirds of the blood from the umbilical vein enter the circulation of the fetus?
enters the liver proper from the inferior border of the liver portal vein
Fetal circulation
Fetal circulation
https://en.wikipedia.org/wiki/Fetal%20circulation
Blood from the placenta is carried to the fetus by the umbilical vein. In humans, less than a third of this enters the fetal "ductus venosus" and is carried to the inferior vena cava, while the rest enters the liver proper from the inferior border of the liver. The branch of the umbilical vein that supplies the right lobe of the liver first joins with the portal vein.