Question: Where does the blastocyst implanted in the female human reproductive system?

context: Implantation is critical to the survival and development of the early human embryo. It establishes a connection between the mother and the early embryo which will continue through the remainder of the pregnancy. Implantation is made possible through structural changes in both the blastocyst and endometrial wall. The zona pellucida surrounding the blastocyst breaches, referred to as hatching. This removes the constraint on the physical size of the embryonic mass and exposes the outer cells of the blastocyst to the interior of the uterus. Furthermore, hormonal changes in the mother, specifically a peak in luteinizing hormone (LH), prepare the endometrium to receive and envelop the blastocyst. The immune system is also modulated to allow for the invasion of the foreign embryonic cells. Once bound to the extracellular matrix of the endometrium, trophoblast cells secrete enzymes and other factors to embed the blastocyst into the uterine wall. The enzymes released degrade the endometrial lining, while autocrine growth factors such as human chorionic gonadotropin (hCG) and insulin-like growth factor (IGF) allow the blastocyst to further invade the endometrium.
question: Where does the blastocyst implanted in the female human reproductive system typically?
short_answers: endometrial wall
endometrium
uterine wall
context: Because pregnancy is outside the uterus, abdominal pregnancy serves as a model of human male pregnancy or for females who lack a uterus, although such pregnancy would be dangerous. 
question: Where does the blastocyst implanted in the female human reproductive system when ectopic pregnancy occurs?
short_answers: outside the uterus
context: No context provided
question: Where does the blastocyst implanted in the female human reproductive system in a normal pregnancy?
short_answers: wall of the uterus
uterus
the endometrium of the uterine wall
uterine wall
context: No context provided
question: Where does the blastocyst implanted in the female human reproductive system in an ectopic pregnancy?
short_answers: fallopian tube, cervix, ovaries, or within the abdomen

Answer: Implantation is critical to the survival and development of the early human embryo. It establishes a connection between the mother and the early embryo which will continue through the remainder of the pregnancy. Once bound to the extracellular matrix of the endometrium, trophoblast cells secrete enzymes and other factors to embed the blastocyst into the uterine wall. Ectopic pregnancy is a complication of pregnancy in which the embryo attaches outside the uterus. In an ectopic pregnancy the blastocyst can be implanted in the fallopian tube, cervix, ovaries, or within the abdomen.