Name any two copper releasing intrauterine devices. List two reasons that make them effective contraceptives

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Copper releasing intrauterine devices function by releasing copper ions which can most effectively suppress sperm motility and the fertilising capacity of sperms.  For example, Copper T is a simple copper releasing intra-uterine device (IUD) made of a flexible, "T" shaped piece of plastic wrapped with a thin copper containing wire. It consists of a flexible cross arm, a vertical arm and two threads or strings. The copper wire is wound on the two arms that releases copper ions which can most effectively suppress sperm motility and the fertilising capacity of sperms. In this way, it prevents pregnancy.

Some other Cu releasing intrauterine devices are- Cu-7, Multiload 375.

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1)Cu releasing contraceptives are Currently T and Multiload 375 2) a.Suppress sperm motility or fertilising capacity of sperms b.Increases phagocytosis of sperms in uterus
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