In humans,the exchanges of materials between the embryo and its mother occur through the
A) umbilical cord.
B) amnion.
C) yolk sac.
D) endometrium.

Question

Quizplus · Accepted Answer

The umbilical cord connects the developing embryo to the placenta, which is attached to the mother's uterus. The placenta allows for the exchange of nutrients, oxygen, and waste products between the mother's blood and the embryo's blood through a network of blood vessels in the umbilical cord. The amnion is a fluid-filled sac that surrounds the embryo, providing protection and cushioning. The yolk sac is a structure that produces blood cells and germ cells in early development. The endometrium is the lining of the uterus that builds up and sheds during the menstrual cycle.

In Humans,the Exchanges of Materials Between the Embryo and Its