Difference between postnatal circulation and fetal circulation?

Answer 1

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.

Answer 2

In fetal circulation there is a hole-the foramen ovale- located between the right and left atria. Most of the blood flows from the right atrium into the left atrium. In the non-fetal heart, blood flows from the right atrium into the right ventricle. In the fetus there is also a connection between the pulmonary trunk and the aorta-ductus arteriosis- that allows blood to flow from the pulmonary trunk into the aorta. Normal circulatory systems do not have that connection, blood flows from the pulmonary trunk into the lungs. Fetuses also have a blood vessel called the ductus venosus that allows most of the blood to bypass the liver. Normal circulation does not have this, all of the blood in the normal body is filtered through the liver. Normally, after a baby is born, the foramen ovale, ductus arteriosis, and the ductus venosus close.

Answer 3

Two umbilical arteries carry fetal blood to placenta.
Placenta: exchange of oxygen and other substances between the separated maternal and fetal blood occurs.
Umbilical vein (one) returns oxygenated blood from placenta to fetus; enters body through umbilicus and goes to undersurface of liver, where drains into inferior vena cava.
Foramen ovale is an opening in septum between right and left atria of the fetal heart.

When umbilical cord is cut, the two umbilical arteries, the placenta and the umbilical vein no longer function.
Foramen ovale functionally closes shortly after a newborn’s first breath and pulmonary circulation is established.
The fetus doesn't need oxygen from the lungs so the opening between the left and right atria helps to bypass the blood flow. This closes at birth when the fetus takes her first breath and the circulation becomes what might be called normal.

Answer 4

In postnatal circulation, the baby's blood flows from the heart to the lungs for oxygenation before returning to the heart to be pumped out to the rest of the body. In fetal circulation, the placenta functions as the organ of gas exchange, where the baby receives oxygen and nutrients from the mother's blood and eliminates waste products. Additionally, in fetal circulation, certain structures like the ductus arteriosus and foramen ovale allow blood to bypass the non-functioning fetal lungs.

Answer 5

During fetal circulation, oxygenated blood is provided by the placenta to the fetus. Postnatal circulation is when the born child gets its own oxygen from the air and the lungs.

Answer 6

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