The Ductus Venosus
The ductus venosus shunts most of the left umbilical vein blood flow directly to the inferior vena cava. This allows relatively highly oxygenated blood from the placenta to bypass the liver and get to the fetal brain.
In the fetus, the ductus venosus shunts a significant majority (80%) of the blood flow of the umbilical vein directly to the inferior vena cava. Thus, it allows oxygenated blood from the placenta to bypass the liver. In conjunction with the other fetal shunts, the foramen ovale and ductus arteriosus, it plays a critical role in preferentially shunting oxygenated blood to the fetal brain.Source(s):http://en.wikipedia.org/wiki/Ductus_veno…
A fetal pig liver has four lobes in their liver. These four lobes are used for blood filtering nutrients and toxins in their bloodstream.
The Ductus arteriosis allows the oxygenated blood to bypass the non-functioning lungs by going straight from the right ventricle to the aortic arch, instead of going through the pulmonary artery. The Ductus Venosus allows half of the blood from the umbilical vein to be shunted to the inferior vena cava to bypass the babies liver. And the Foramen ovale lets blood go straight from the right atrium to the left atrium, the Ductus Arteriosis is a back up for when blood gets left behind. The foramen ovale closes over at birth to form the fossa ovalis.
The structure that allows blood to bypass a fetus inmmature liver is called ductus venosus.
In the fetus, the ductus venosus shunts a significant majority (80%) of the blood flow of the umbilical vein directly to the inferior vena cava. Thus, it allows oxygenated blood from the placenta to bypass the liver. In conjunction with the other fetal shunts, the foramen ovale and ductus arteriosus, it plays a critical role in preferentially shunting oxygenated blood to the fetal brain.Source(s):http://en.wikipedia.org/wiki/Ductus_veno…
The digestive tract and the liver are connected by the hepatic portal vein. This allows nutrients to pass from the digestive tract to the liver for processing.
The specialized systm for supplying oxygenated blood to fetal organs bypassing the fetal lungs. Fetus take oxygen and nutrient from placenta. In fetus there are a few specialized structures by which fetal blood bypass the non functional lungs. These are; 1. Foramen Ovale 2. Ductus Arteriosus 3. Ductus venosus The deoxygenated blood is carried to the placenta via umblical artries and from there oxygenated blood is carried back via umblical vein. On its way back to heart this blood is passed through liver but liver is only partialy functional so most of the blood bypass the portal circulation via DUCTUS VENOSUS. Then blood enters the right atrium via inferior vena cava. From where this blood is carried to left atrium through FORAMEN OVALE. And then through the left heart to the body. Specially head and upper limb region. While the deoxygenated blood from the body is carried via the superior vena cava to the right atrium from where this blood is pumped into right ventricle to the lungs. But only 12% blood is gone to the lungs and the rest is gone via umblical artry to placenta bypassing the pulmonary circulation through DUCTUS ARTERIOSUS.
The function of the spleen in fetal pigs is to filter the blood and remove old or dying blood cells. The liver is the largest organ in the body.
Placenta
In a fetus it is in the liver and I think spleen and in an adult or any child it is in the bones if that answers your question.
- Yolk sac, liver, spleen, thymus, lymph nodes and red bone narrow