Q: Designed to exchange materials, what spongy structure consists of membranes and blood vessels from both mother and embryo?


Read this paragraph and choose the correct option from the provided answers:

The placenta is a spongy structure. It consists of membranes and blood vessels from both mother and embryo (see Figure below ). The placenta passes oxygen, nutrients, and other useful substances from the mother to the fetus. It also passes carbon dioxide and other wastes from the fetus to the mother. The placenta lets blood from the fetus and mother exchange substances without actually mixing. Thus, it protects the fetus from being attacked by the mother’s immune system as a “foreign parasite. ”.

 Choices:

- endometrium

- uterus

- umbilicus

- placenta


A:
placenta