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List any two types of IUDs that are avai...

List any two types of IUDs that are available for human females and state their mode of action.

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Cu T (copper releasing IUD's) and progestasert (hormone releasing). Their mode of action :
(i) Cu ions release suppress sperm motility and fertilising capacity of sperms.
(ii) The hormone releasing IUD's make the uterus unsuitable for implantation and the cervix hostile to the sperms.
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