Examine This Close-Up of the Placenta (On the Left of the Figure

question 55

Multiple Choice

Examine this close-up of the placenta (on the left of the figure below) .

Why do the chorionic villi have the shape of a tree?

• A) The branches of the chorionic villi create a large amount of surface area for the exchange of nutrients and gases between maternal and fetal blood.
• B) The branches of the chorionic villi allow blood to flow back and forth more rapidly between the capillaries of the mother and her fetus.
• C) The branches of the chorionic villi create more locations where fetal capillaries can fuse directly with maternal capillaries.
• D) The branches of the chorionic villi create more surface area for the production of the amniotic fluid.

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