The Chorionic Villi

question 11

Multiple Choice

The chorionic villi

• A) help prepare the mammary glands for milk production.
• B) are free endodermal tips that grow toward the wall of the blastocyst.
• C) bulge into the amniotic cavity at the head fold and extend toward the trophoblast.
• D) provide the surface area for gaseous exchange between fetal and maternal bloodstreams.
• E) form constrictions that narrow the yolk stalk and the body stalk between the embryo and the surrounding trophoblast.

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