Gases are Exchanged in a Mammalian Embryo in The

Question

Gases are exchanged in a mammalian embryo in the
A)amnion.
B)hypoblast.
C)chorion.
D)trophoblast.
E)yolk sac.

Accepted Answer

Gases are exchanged in the chorion, which is a membrane that surrounds the embryo and eventually becomes part of the fetal placenta. The amnion and yolk sac are involved in protection and nourishment of the embryo, respectively. The hypoblast and trophoblast are layers of cells involved in development and implantation of the embryo, but not in gas exchange.