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Cu ions released from copper-releasing Intra Uterine Devices (IUDs):

1. make uterus unsuitable for implantation
2. increase phagocytosis of sperms
3. suppress sperm motility
4. prevent ovulation

Correct answer: suppress sperm motility

Solution

Copper released from an IUD creates a local environment that is toxic to sperm, especially reducing their motility and ability to reach the egg. It does not primarily stop ovulation, which is a hormonal effect.

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