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Questions and Answers
What is the primary route for enriched blood to enter the right atrium from the inferior vena cava?
How does enriched blood from the right atrium primarily reach the left atrium?
Which structure allows most of the blood in the pulmonary artery to bypass the lungs?
What is the fate of a small amount of blood in the pulmonary artery?
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What happens to the enriched blood that enters the portal system from the umbilical vein?
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From where does the depleted blood return to the right atrium?
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After passing through the ductus venosus, where does the enriched blood primarily go?
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Which vessels give rise to the umbilical arteries that return blood to the placenta?
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Study Notes
Fetal Circulation
- Oxygenated blood from the placenta travels through the umbilical vein
- Some oxygenated blood enters the portal system and mixes with deoxygenated blood from the liver
- Most oxygenated blood enters the inferior vena cava (IVC) and mixes with deoxygenated blood from the lower body
- Oxygenated blood from the IVC enters the right atrium (RA)
- Some oxygenated blood mixes with deoxygenated blood from the superior vena cava (SVC) in the RA and travels to the right ventricle (RV) and pulmonary artery (PA)
- Most oxygenated blood in the RA is shunted through the foramen ovale (FO) into the left atrium (LA) and mixes with a small amount of blood from the lungs
- Oxygenated blood then enters the left ventricle (LV) and aorta (AO)
- Oxygenated blood from the aorta supplies the brain and upper body
- Deoxygenated blood returns from the brain and upper body via the superior vena cava (SVC) to the RA
- Deoxygenated blood from the SVC mixes with oxygenated blood from the IVC in the RA and travels to the RV and PA
- Some deoxygenated blood from the PA travels to the lungs and returns to the LA through the four pulmonary veins (PV)
- Most deoxygenated blood from the PA is shunted through the ductus arteriosus (DA) into the aorta and mixes with oxygenated blood
- Deoxygenated blood from the DA travels to the abdominal aorta, common iliac arteries, and internal iliac arteries
- Internal iliac arteries give rise to the two umbilical arteries which return to the placenta
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Description
Test your knowledge on fetal circulation and the pathway of oxygenated and deoxygenated blood in the fetal body. Understand how blood mixes and the significance of structures like the umbilical vein and foramen ovale. This quiz is essential for those studying human anatomy and physiology.
