Gynaecology & Obstetrics General fbc8051e Bleeding associated with anovulation is due to A Persistent proliferative endometrium. B Alterations in endometrial vascular structure. C Increased endometrial responsiveness to vasodilating prostaglandins. D Impaired prostaglandins concentration. High-Yield Explanation As ovulation does not occur, proliferative endometrium persists causing bleeding.