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How do intrauterine devices prevent conc...

How do intrauterine devices prevent conception in humans?

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Role of IUD in contraception :
`cdot` Increase phagocytosis of sperms within the uterus.
`cdot` Copper ions released by them decrease motility and fertilizing capacity of sperms.
`cdot` Hormone releasing IUDs prevent implantation.
`cdot` Hormone releasing IUDs also make the cervix hostile for sperms.
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