How do Cu-T and Cu 7 acts as contraceptive devices ?
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Cu-T, Cu 7 are intra uterine, contraceptive devices having ionized copper. The copper defuses into uterus. It brings about the release of toxic cytokinins. They inhibit the sperm motility and therefore fertilization of ovum. Another categories of IUDs are hormonal in nature. (Eg: LNG – 20).