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Explain about Implantation .... ? " munipalli akshay paul "
Implantation is the process by which a fertilized egg (blastocyst) attaches itself to the lining of the uterus (endometrium), marking the beginning of pregnancy. It typically occurs 6 to 10 days after ovulation and is a critical step for the successful development of an embryo.
Steps of Implantation
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Fertilization:
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Occurs in the fallopian tube, forming a zygote.
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Cell Division and Travel:
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The zygote divides into a ball of cells (blastocyst) while traveling down the fallopian tube toward the uterus.
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Arrival in the Uterus:
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Around day 5–6 after ovulation, the blastocyst reaches the uterus.
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Attachment to Uterine Lining:
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The blastocyst adheres to the endometrium, the thickened uterine lining prepared by progesterone.
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The outer layer of the blastocyst (trophoblast) begins to invade the endometrial tissue.
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Embedding and Growth:
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The blastocyst becomes fully embedded in the uterine wall.
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It starts forming the placenta, which will nourish the embryo.
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Signs of Implantation
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Implantation bleeding: Light spotting (pink or brown) that lasts 1–3 days (not always present)
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Mild cramping: Similar to menstrual cramps
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Basal body temperature may remain elevated
Hormonal Changes
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After implantation, the embryo produces hCG (human chorionic gonadotropin) — the hormone detected by pregnancy tests.
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hCG signals the body to maintain the uterine lining and halt menstruation.
Factors That Support Implantation
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Proper timing of ovulation and fertilization
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Healthy endometrial lining
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Balanced hormone levels (especially progesterone)
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No uterine abnormalities (e.g., fibroids, scarring)
Problems with Implantation
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Implantation failure can occur due to hormonal imbalances, poor embryo quality, or uterine abnormalities.
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Ectopic pregnancy: When implantation happens outside the uterus, usually in the fallopian tube — a medical emergency.
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