What are the steps of fetal circulation?

What are the steps of fetal circulation?

Inside the fetal heart

  • Blood enters the right atrium.
  • Blood then passes into the left ventricle.
  • From the aorta, blood is sent to the heart muscle itself and to the brain and arms.
  • This less oxygenated blood is pumped from the right ventricle into the pulmonary artery.

What are the 3 shunts in fetal circulation?

Therefore, the current anatomical nomenclature of the fetal cardiac shunts is historically inappropriate.


What is the fetal circulation?

In animals that give live birth, the fetal circulation is the circulatory system of a fetus. The term usually encompasses the entire fetoplacental circulation, which includes the umbilical cord and the blood vessels within the placenta that carry fetal blood.

What are the 4 shunts in fetal circulation?

The closure of the ductus arteriosus, ductus venosus, and foramen ovale completes the change of fetal circulation to newborn circulation.

What is ductus arteriosus?

Patent ductus arteriosus (PDA) is a persistent opening between the two major blood vessels leading from the heart. The opening (ductus arteriosus) is a normal part of a baby’s circulatory system in the womb that usually closes shortly after birth. If it remains open, it’s called a patent ductus arteriosus.

Why are there 2 umbilical arteries?

The umbilical cord usually contains two arteries and one vein. The vein carries the oxygenated blood from the placenta to the fetus. The arteries carry the deoxygenated blood and the waste products from the fetus to the placenta.

How does the fetal heart work?

Waste products from the fetal blood are transferred back across the placenta to the mother’s blood. Inside the fetal heart: Blood enters the right atrium, the chamber on the upper right side of the heart. When the blood enters the right atrium, most of it flows through the foramen ovale into the left atrium.

How many shunts are in fetal circulation?

three shunts
The fetal circulatory system uses three shunts, which are small passages that direct blood that needs to be oxygenated. The purpose of these shunts is to bypass certain body parts–in particular, the lungs and liver–that are not fully developed while the fetus is still in the womb.

What are the 3 important shunts that must close after birth?

Three shunts in the fetal circulation

  • Ductus arteriosus. protects lungs against circulatory overload. allows the right ventricle to strengthen.
  • Ductus venosus. fetal blood vessel connecting the umbilical vein to the IVC.
  • Foramen ovale. shunts highly oxygenated blood from right atrium to left atrium.

What are the 3 fetal shunts and what are their functions?

The fetal circulatory system bypasses the lungs and liver with three shunts. The foramen ovale allows the transfer of the blood from the right to the left atrium, and the ductus arteriosus permits the transfer of the blood from the pulmonary artery to the aorta.

What is in Wharton’s jelly?

Wharton’s jelly (substantia gelatinea funiculi umbilicalis) is a gelatinous substance within the umbilical cord, largely made up of mucopolysaccharides (hyaluronic acid and chondroitin sulfate).

What does cord 3 vessels mean?

The umbilical cord is a tube that connects you to your baby during pregnancy. It has three blood vessels: one vein that carries food and oxygen from the placenta to your baby and two arteries that carry waste from your baby back to the placenta.

How is fetal circulation different?

Most of the blood that leaves the right ventricle in the fetus bypasses the lungs through the second of the two extra fetal connections known as the ductus arteriosus. The ductus arteriosus sends the oxygen poor blood to the organs in the lower half of the fetal body.

Why is fetal circulation important?

Through the blood vessels in the umbilical cord, the fetus receives all the necessary nutrition, oxygen, and life support from the mother through the placenta. Waste products and carbon dioxide from the fetus are sent back through the umbilical cord and placenta to the mother’s circulation to be eliminated.

Where does a fetus get its blood?

The fetus is connected by the umbilical cord to the placenta, the organ that develops and implants in the mother’s uterus during pregnancy. Through the blood vessels in the umbilical cord, the fetus receives all the necessary nutrition, oxygen, and life support from the mother through the placenta.

What is meant by Tetralogy of Fallot?

Tetralogy of Fallot (pronounced te-tral-uh-jee of Fal-oh) is a birth defect that affects normal blood flow through the heart. It happens when a baby’s heart does not form correctly as the baby grows and develops in the mother’s womb during pregnancy.