Correct Answer - A
Ans. is None/ a i.e. 3-4 mm
"7he Endometrium is in the secretory phase corresponding to 20 -
21 days of cycle" at the time of implantation. "After ovulation, the endometrium now demonstrates a combined reaction to estrogen and progesterone activity. Most impressive is that total endometrial height is fixed at roughly its preovulatory extent (5-6 mm) despite continued availability of estrogen." Reading the above text it is clear that endometrium is - 5 - 6 mm thick at the time of implantation, which is not given in the option. Still if you have to mark one answer option 'a' i.e. 3 - 4 mm being closest could be right.
Extra Edge
Implantation occurs 7 - 9 days after ovulation.
In human, the blastocyst burrows in the uterine cavity till whole of it lies within the thickness of endometrium. This is called as interstitial implantation.
After implantation of the embryo the uterine endometrium is called the decidua".
Decidua basalis - The part of decidua where the placenta is to be formed.
Decidua Capsularis - The part of the decidua that separates the
embryo from the uterine lumen.
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1June 11, 2026 8K 5
