The chorionic villi
A) form the umbilical cord.
B) form the umbilical vein.
C) form the umbilical arteries.
D) increase the surface area available for exchange between the placenta and the maternal blood.
E) form the portion of the placenta called the decidua capsularis.

Question

Quizplus · Accepted Answer

Chorionic villi are finger-like projections that protrude from the chorion and extend into the maternal blood within the uterus. Their function is to exchange nutrients, oxygen, and waste products between the developing fetus and the mother. They increase the surface area available for exchange between the placenta and the maternal blood.

The Chorionic Villi