The Chorion

Question

The chorion
A) contains human embryonic stem cells (hESC).
B) is a membrane inside the embryo.
C) protects the embryo.
D) forms in the last trimester of pregnancy.
E) is an extension of the embryo.

Accepted Answer

The chorion is a membrane that forms around the embryo and serves to protect it.

Answer: A 
 The chorion contains human embryonic stem cells (hESC), which can differentiate into various types of cells in the body.

Answer: E 
 The chorion is an extension of the embryo that eventually fuses with the amnion to form the amniotic sac.

Answers B and D are incorrect. The chorion is not a membrane inside the embryo, and it forms much earlier than the last trimester of pregnancy.