The cells of a blastocyst that give rise to the placenta are the
A) trophoblast.
B) chorion.
C) inner cell mass.
D) zona pellucida.
E) blastomere.

Question

Quizplus · Accepted Answer

The trophoblast cells are the outermost layer of cells of the blastocyst and are responsible for forming the placenta. The chorion is the membrane that surrounds the embryo and contributes to the formation of the placenta. The inner cell mass gives rise to the embryo proper. The zona pellucida is a layer of glycoproteins that surrounds the blastomeres in early embryonic development. Blastomeres are the individual cells produced by the cleavage of the fertilized egg.

The Cells of a Blastocyst That Give Rise to the Placenta