How many umbilical arteries are present, and what is their function?

The correct response highlights that there are two umbilical arteries, and their primary function is to return deoxygenated blood from the fetus back to the placenta. This anatomical structure plays a crucial role in fetal circulation.

During fetal development, the umbilical arteries are responsible for transporting blood that is low in oxygen and high in carbon dioxide away from the fetus. The blood then routes through the placenta, where it becomes oxygenated by maternal blood. This exchange is vital for ensuring that the developing fetus receives necessary oxygen and nutrients.

Understanding the correct number of umbilical arteries and their function helps in grasping the overall mechanism of fetal circulation and the importance of the placenta in maintaining fetal health.