A woman experiences a shortened luteal phase following ovulation. Why does the uterine lining fail to properly thicken during this period?

💡 Explanation

The uterine lining thickening depends on sufficient progesterone secretion from the corpus luteum during the luteal phase; because inadequate progesterone production occurs, the endometrium does not fully develop, therefore implantation is less likely, rather than estrogen deficiency, premature LH termination, or elevated FSH directly affecting endometrial thickening.

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