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Why is Cu-T considered a good contracept...

Why is Cu-T considered a good contraceptive device to space children?

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(a) Copper releasing IUDs (CuT, Mulyiload 325)`rarr` These increase phagocytosis of sperms within uterus copper ions which suppress sperm motility and ferilising capacity of sperm.
Hormone releasing IUDs-Progestasert, LNG-20-These makes uterus unsuitable for implantation and the cervix hostile to sperms.
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