Under the influence of the trophoblast,maternal blood vessels in the endometrium
A)disappear.
B)attach to the inner cell mass.
C)break down and form lacunae.
D)form a capillary network in the trophoblast.
E)increase in size and penetrate the blastocyst.

Question

Quizplus · Accepted Answer

Under the influence of the trophoblast, maternal blood vessels in the endometrium break down and form lacunae. This allows the trophoblast to directly access maternal blood, which is important for nutrient and oxygen exchange between the embryo/fetus and mother.

Under the Influence of the Trophoblast,maternal Blood Vessels in the Endometrium