Question

Where is the highest oxygen concentration presents in fetal circulation

• A. SVC
• B. IVC
• C. Right ventricle
• D. Aorta

Answer 1

The Correct Option is B

In fetal circulation, the highest oxygen concentration is found in the inferior vena cava (IVC). Here's how the process works:

• Oxygen-rich blood from the placenta travels through the umbilical vein.
• It then passes through the ductus venosus, bypassing the liver, into the IVC.
• As a result, the IVC carries highly oxygenated blood to the right atrium of the heart.
• From the right atrium, most of the oxygen-rich blood is directed through the foramen ovale into the left atrium, then to the left ventricle, and subsequently out to the body via the aorta.

This routing ensures that oxygen-rich blood first supplies the fetal brain and heart.

Vessel/Chamber	Oxygen Concentration
IVC	Highest
Right Atrium	High
Left Atrium	High
Aorta	Moderate

Therefore, among the given options, the IVC has the highest oxygen concentration.