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Question

Cu ions released from copper-releasing intra uterine device IUDs


A

Make uterus unsuitable for implantation

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B

Increase phagocytosis of sperms

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C

Suppress sperm motility

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D

Prevent ovulation

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Solution

The correct option is C

Suppress sperm motility


Copper ions prevent pregnancy by inhibiting the movement of sperm, because the copper-ion-containing fluids are directly toxic to sperm. Even if an aggressive little spermatozoa fertilizes an egg, the copper ion laden environment prevents implantation of the fertilized egg, and thus pregnancy.


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