If a woman with normal estradiol levels receives an injection of a drug that strongly antagonizes progesterone receptors during the luteal phase, which consequence follows?

💡 Explanation

Progesterone maintains the endometrial lining during the luteal phase; antagonizing progesterone receptors will destabilize this lining, because endometrial support diminishes, therefore menstruation is triggered rather than sustained thickening, altered mucus viscosity, or increased basal body temperature which are all related to progesterone's effects.

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