(a) Name any two copper releasing IUDs. (b) Explain how do they act as effective contraceptives in human females.

(a) The copper releasing IUDs are Cu-T, Cu-7 and multiload 375
(b) Cu-releasing IUDs act by increasing phagocytosis of sperms within the uterus. The Cu2+ ions released suppress sperm motility as well as their fertilizing capacity, thus preventing contraception. Thus, they are effective contraceptives in human females.