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25 maj 2023 · Once the cardiovascular system is fully established, blood circulation commences and the embryo can directly derive nutrients from its own blood supply. This article will cover the anatomy, structure and function of the fetal circulation.
18 wrz 2023 · The oxygen-rich blood that enters the fetus passes through the fetal liver and enters the right side of the heart. Blood coming back from the fetus also enters the right atrium through the superior vena cava and coronary arteries.
26 kwi 2023 · Fetal circulation bypasses the lungs via a shunt known as the ductus arteriosus; the liver is also bypassed via the ductus venosus, and blood can travel from the right atrium to the left atrium via the foramen ovale. Normal fetal heart rate is between 110 and 160 beats per minute.
The fetal circulation is composed of the placenta, umbilical blood vessels encapsulated by the umbilical cord, heart and systemic blood vessels. A major difference between the fetal circulation and postnatal circulation is that the lungs are not used during the fetal stage resulting in the presence of shunts to move oxygenated blood and ...
1 maj 2023 · After being carried through the inferior vena cava, the next stop for blood is the right atrium of the fetal heart. In an adult, the heart and lungs work together to both replenish the oxygen content of blood, and then pump that oxygenated blood to be distributed throughout the body.
The fetal circulatory system uses two right to left 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.
The closure of the ductus arteriosus, ductus venosus, and foramen ovale completes the change of fetal circulation to newborn circulation. 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.
