Describe the chorionic villi
A) The chorionic villi contain fluid that surrounds and cushions the embryo or fetus.
B) The chorionic villi forms the interface between the embryonic/fetal system and the amniotic fluid.
C) The chorionic villi forms the umbilical cord.
D) The chorionic villi are structures that extend into the maternal tissues through which maternal blood flows.
E) The chorionic villi form the yolk sac.
Answer: D
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