Question

Which one of the following is the precise site of embryo implantation in a normal pregnancy?
A) Endometrium
B) Vagina
C) Oviduct
D) Cervix

Answer 1

Hint: This is the inner, capillary-rich wall of the uterus, where implantation of the growing human foetus takes place. The fallopian tube must transport the egg into the uterus for several days. A fertilised egg often adheres to (implants in) the uterine lining after it is within the uterus (endometrium).

Complete Step by Step Answer:
Preparation for implantation, maintaining pregnancy if implantation happens, and menstruation in the absence of pregnancy are the physiological activities of the uterine endometrium (uterine lining). Thus, the endometrium is crucial to the reproduction and survival of our species.
A healthy pregnancy requires a healthy endometrium. At any point in the menstrual cycle, an endometrial thickness of less than 14 mm is commonly regarded as normal. Premenopausal women's endometrial thickness varies between two and four millimetres during menstruation.
The exit from an ovary in mammals is called an oviduct. This is more commonly referred to as the Fallopian tube or uterine tube in female humans. The oviduct is the path used by the eggs. These eggs will either degenerate within the body or be fertilised by sperm to form a zygote.

Hence, option A is the correct answer.

Note: Proteins, lipids, and glycogen are all secreted by the endometrium's glands. An embryo needs them to survive. They also stop the endometrium from disintegrating. Human chorionic gonadotropic hormone will start to be secreted by the growing placenta if an embryo inserts itself into the endometrial wall (hCG).