Implantation of the fertilized ovum into the uterine wall typically occurs within ____________?
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Answer: D. 1 week
Explanation
Implantation of the developing blastocyst into the uterine wall occurs about one week post-fertilization. The blastocyst hatches from the zona pellucida and embeds in the receptive endometrium. Option D is correct because implantation typically takes place within one week. Fertilization usually takes place in the ampulla of the fallopian tube after ovulation. The zygote undergoes multiple mitotic cleavage divisions while traveling down the uterine tube. By day seven, the embryo reaches the blastocyst stage and initiates uterine invasion.
Successful implantation triggers human chorionic gonadotropin production to maintain the corpus luteum. Abnormal implantation outside the uterine cavity results in dangerous ectopic pregnancies. Endometrial preparation by progesterone is vital for successful blastocyst embedding. Option A suggests a much longer interval than the standard one-week implantation timeline. Option B represents a full menstrual cycle duration rather than the timing of implantation. Option C spans two months, which far exceeds the early embryonic implantation window.
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