What does the umbilical vein do in utero?

• A. Delivers deoxygenated blood to the placenta
• B. Delivers oxygenated blood from the placenta to the fetus
• C. Removes waste products from the fetus
• D. Transports nutrients from the fetus to the placenta

Answer: (B)

The umbilical vein plays a crucial role in fetal circulation by delivering oxygenated blood from the placenta to the fetus. In the prenatal environment, the placenta acts as the site for gas exchange and nutrient transfer between the mother and the developing fetus. Oxygen and nutrients from the maternal blood are transferred into the umbilical vein, which then transports this oxygen-rich blood to the fetus.

In contrast, deoxygenated blood from the fetus is carried back to the placenta through the umbilical arteries, where it can release carbon dioxide and waste products. This unidirectional flow ensures that the fetus receives the necessary oxygen and nutrients for growth and development, while waste products are effectively eliminated.