The __________ is an embryonic membrane that serves as the origin of the first blood and germ cells.
A) yolk sac
B) allantois
C) chorion
D) amnion
E) placenta

Question

Quizplus · Accepted Answer

The yolk sac is an embryonic membrane that serves as the origin of the first blood and germ cells. The allantois is an embryonic membrane that is involved in blood vessel formation and waste elimination. The chorion is an embryonic membrane that contributes to the formation of the placenta. The amnion is an embryonic membrane that forms a fluid-filled sac around the developing embryo. The placenta is an organ that develops during pregnancy and facilitates nutrient and waste exchange between the mother and fetus.

The __________ Is an Embryonic Membrane That Serves as the Origin