Mechanism of action of IUCD is A/E -
Ans. is 'b' i.e., Anovulation IUCD does't affect ovulation. Mechanism of actions of IUDs 1) Most accepted Induce a foreign - body reaction that results in chronic inflammatory reaction --> cellular and biochemical changes in the endometrium and uterine fluids. These changes impair the bility of the gamete and thus reduce its chances of feilization rather than its implantation. "IUDs prevent feilization primarily by interfering with the ability of sperm to survive and to ascend the fallopion tubes, where feilization curs". Reaserch aicles "Whatever the IUD's specific mechanism of action, it appears that the IUD effectively interrupts the reproductive process of implantation ". 2) In medicated IUDs, copper enchances the cellular response in the endometrium. By altering the biochemical composition of cervical mucus, copper ions may affect sperm motility, capaciation and survival. Hormone - releasing devices increase the viscosity of cervical mucus and thereby prevent sperm from entering the cervix. They also maintain high level of progesterone in the endometrium and thus, relatively low levels of estrogen, thereby sustaining an endometrium unourable to implantation.
Chronic endometrial inflammation
Anovulation
Tubal motility alteration
Endometrial atrophy