Explanation

IUD (i) Increases phagocytosis of sperms (ii) Releases ions that suppresses the sperm motility and fertilizing capacity of sperms (iii) Makes uterus unsuitable for implantation Intra Uterine Devices (IUDs) for contraception (i) There devices are inserted by the doctors into the uterus through vagina. (ii) There are three types of IUDs Non-medicated IUDs They increases the phagocytosis of the sperm within the uterus, $e.g.,$ Lippes loop Copper Releasing IUDs Along with phagocytosis of the sperms, the copper ions released, suppresses the sperm motility and the fertilizing capacity of the sperm. $e.g.,$ Cu-T, Cu-7, multiload-375 Hormone Releasing IUDs They makes the uterus unsuitable for implantation and the cervix hostile to the sperms, $e.g$, progestasert, LNG-20