What Is Neonatal Circulation?

Fetal Circulation.

The blood that flows through the fetus is actually more complicated than after the baby is born (normal heart).

This hole allows the reddest blood to go from the right atrium to left atrium and then to the left ventricle and out the aorta.

What is 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 changes occur in fetal circulation at birth?

16.9 Embryo-fetal circulation system – changes at birth

With birth, a change from parallel flow through the heart to a serial one gradually takes place. The following changes must occur: The gas exchange takes place in the baby’s lungs. By cutting the umbilical cord, the placental circulation system is switched off.

What are the 3 shunts in fetal circulation?

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 is blood circulation?

The systemic circulation provides the functional blood supply to all body tissue. It carries oxygen and nutrients to the cells and picks up carbon dioxide and waste products. Systemic circulation carries oxygenated blood from the left ventricle, through the arteries, to the capillaries in the tissues of the body.

What is the difference between fetal circulation and normal circulation?


The umbilical arteries carry deoxygenated blood from the whole body to the placenta which is the gaseous exchange site prenatally. On the other hand, the umbilical vein returns oxygenated blood from the placenta back to the fetus.

Why is fetal circulation important?

The fetal circulatory system uses 3 shunts. These are small passages that direct blood that needs to be oxygenated. The purpose of these shunts is to bypass the lungs and liver. That’s because these organs will not work fully until after birth.

What triggers a newborn’s first breath?

During vaginal birth, the newborn’s chest is compressed by the birth canal. Upon delivery, negative pressure allows air into the lungs. The first cries of the infant allow for alveoli expansion and absorption of fetal lung fluid.

What happens to the umbilical artery after birth?

It is a spongy structure, filled with blood vessels that come from the mother by way of the lining of the uterus, and then connects with the baby by the umbilical cord. It is expelled from the mother within a half-hour after birth. It is still attached to the placenta, which is commonly called “the afterbirth.”

What does the umbilical artery become after birth?

After development

The umbilical artery regresses after birth. A portion remains open as a branch of the anterior division of the internal iliac artery. The umbilical artery is found in the pelvis, and gives rise to the superior vesical arteries.

How is fetal circulation different?

Fetal Circulation. The blood that flows through the fetus is actually more complicated than after the baby is born (normal heart). When blood goes through the placenta it picks up oxygen and becomes red. The red blood then returns to the fetus via the third vessel in the umbilical cord (umbilical vein).

What are the shunts in fetal circulation?

The fetal circulatory system uses 3 shunts. These are small passages that direct blood that needs to be oxygenated. The shunt that bypasses the lungs is called the foramen ovale. This shunt moves blood from the right atrium of the heart to the left atrium.

Why do you need two shunts near the heart?

Introduction. Shunts for the blood in the developing heart serve a very practical need. Initially all of the blood returns to the right atrium. This shunt allows a normal development of the left atrium and the left ventricle in that the cardiac musculature on this side is trained.

What are 3 types of circulation?

There are three types of circulation found within humans. Systemic circulation, pulmonary circulation and portal circulation. Pulmonary circulation describes the movement of blood from the heart to the lungs and back to the heart.

What causes poor circulation?

Poor circulation is most common in your extremities, such as your legs and arms. Several conditions can lead to poor circulation. The most common causes include obesity, diabetes, heart conditions, and arterial issues.

Who invented blood circulation?

William Harvey

Photo in the article by “Wikimedia Commons” https://commons.wikimedia.org/wiki/File:Neonatal_Heart_Circulation.png

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