The progestogenic emergency contraceptive pills act by -: (A) Altered cervical secretion, (B) Inhibition of ovulation, (C) Anti-implantation effect, (D) Inhibition of LH secretion
Answer is C. Ans. is 'c' i.e., Anti-implantation effect o If ovulation and feilization occur, the blastocyte fails to implant (anti-implantation effect) because endometrium is either hyperproliferativer or hypersecretory; not suitable for nidation. o This is the mechanism of action of postcoital (emergency) contraceptive pills.