Once diffusion from the endometrium becomes inadequate for delivery of oxygen, the placenta develops from projections of the , which facilitates exchange of nutrients and waste by the .
A)chorionic villi into the endometrium : mixing of maternal and fetal blood
B)chorionic villi into the endometrium : short distance between maternal and fetal blood
C)chorionic villi into the embryo : short distance between maternal and fetal blood
D)amnionic villi into the endometrium : short distance between maternal and fetal blood
E)chorionic villi into the embryo : mixing of maternal and fetal blood

Question

Quizplus · Accepted Answer

The placenta develops from chorionic villi that project into the endometrium, facilitating nutrient and waste exchange by maintaining a short distance between maternal and fetal blood without mixing them.

Once Diffusion from the Endometrium Becomes Inadequate for Delivery of Oxygen