Following ovulation, what causes the uterine lining to thicken and become highly vascularized in preparation for implantation?

💡 Explanation

Increased progesterone secretion by the corpus luteum after ovulation stimulates endometrial gland growth and vascularization through progesterone receptor signaling, because progesterone prepares the uterus for potential implantation. Therefore, the uterine lining thickens, rather than being caused by estrogen receptor downregulation or decreased LH or FSH.

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