The function of copper ions in copper releasing IUD's is :
(1) They inhibit gametogenesis
(2) They make uterus unsuitable for implantation
(3) They inhibit ovulation
(4) They suppress sperm motility and fertilising capacity of sperms

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(4) Cu2+ interfere in the sperm movement, which suppress the sperm motility and fertilising capacity of sperms.

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