The function of copper ions in copper releasing IUDs is:
they suppress sperm motility and fertilising capacity of sperms
they inhibit gametogenesis
they make uterus unsuitable for implantation
they inhibit ovulation
According to the NCERT text, the copper ions released by IUDs (like CuT, Cu7, Multiload 375) suppress sperm motility and the fertilising capacity of sperms. The text distinguishes this from hormone-releasing IUDs, which make the uterus unsuitable for implantation and the cervix hostile to sperms .
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