Blood vessels that will enter the umbilical cord come from the ____.
A)yolk sac
B)amnion
C)chorion
D)allantois
E)chorionic villi

Question

Blood vessels that will enter the umbilical cord come from the ____. ​
A)yolk sac
B)amnion
C)chorion
D)allantois
E)chorionic villi

Quizplus · Accepted Answer

The allantois is a membranous sac that forms as an outpocketing of the developing hindgut in the early embryo. It grows and eventually fuses with the chorion, forming the umbilical cord. Blood vessels from the allantois enter the umbilical cord and connect to the developing fetus, allowing for the exchange of gases and nutrients between the fetal and maternal circulatory systems.

Blood Vessels That Will Enter the Umbilical Cord Come from the ____