Uterine implantation due to enzymatic digestion of the endometrium is initiated by
A)the inner cell mass.
B)the endoderm.
C)the chorion.
D)the mesoderm.
E)the trophoblast.

Question

Quizplus · Accepted Answer

Uterine implantation is primarily driven by the trophoblast, particularly the invasive extravillous trophoblasts that produce and secrete enzymes to digest and penetrate the endometrium. These cells also interact with uterine cells, regulating maternal-fetal immune tolerance and blood flow to ensure successful pregnancy.

Uterine Implantation Due to Enzymatic Digestion of the Endometrium Is