How do Cu ions in copper releasing IUDs prevent fertilization?

How do Cu ions in copper releasing IUDs prevent fertilization? Correct Answer By reducing the motility of the sperms

Copper releasing IUDs include Cu7, CuT, and Multiload 375. These work by dampening the motility of the sperms. This reduces the ability of sperm to cross the barriers of the uterus before reaching the fallopian tube and thus prevents fertilization and pregnancy.
Bissoy MCQ

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