About 8 days after fertilization, the trophoblast develops into two layers in the region of contact between the blastocyst and endometrium. The layer known as the syncytiotrophoblast secretes enzymes that assist the embryo in penetrating the endometrium.
A) both statements are true
B) both statements are false
C) the first statement is true; the second is false
D) the second statement is true; the first is false

Question

Quizplus · Accepted Answer

Both statements are true. About 8 days after fertilization, the trophoblast indeed develops into two layers, one of which is the syncytiotrophoblast. This layer secretes enzymes that help the embryo implant into the endometrium by penetrating it.

About 8 Days After Fertilization, the Trophoblast Develops into Two