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Q. Fill in the Blanks: Implantation of the Embryo Occurs in
Answer: Implantation of the embryo occurs in the uterus of the female body. The uterus is a muscular organ in the female pelvis between the rectum and bladder.
The uterus is also known as the womb, in which the fetus grows and develops at each respective time. The embryo’s implantation in the uterus generally occurs within 9 or 10 days. The embryo is implanted in the uterus approximately after 5 to 6 days of fertilisation. This process takes 6 to 12 days to travel fertilised eggs to the uterus and attach to the uterus.
Implantation occurs when the embryo reaches the blastocyst stage. After fertilisation, it hatches out the zona pellucida and starts the process of implantation. The implantation site of the human uterus is usually in the upper and posterior wall in the sagittal plane. After blastocyst hatches in human implantation, it adheres to the uterus wall. After adhesion, the respective female is considered pregnant, and the embryo receives the required amount of nutrition and oxygen to grow and develop.
To get access to implantation, the uterus must change from being able to receive conceptus changes, including endometrial cell changes and thickness of the endometrium and its blood supply.
The mechanism for implantation includes zone hatching, apposition, molecular mechanism, adhesion, communication, invasion, secretion etc.
Implantation failure occurs due to problems in the embryo itself. It is caused by inadequate uterine receptivity in two-thirds of cases.
The possible implantation symptoms include bleeding, cramps, discharge bloating, nausea, headache, mood swings etc. After implantation, when women get pregnant, the menstrual cycle generally stops.
