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Describe the three manners in which fert...

Describe the three manners in which fertilization of human ovum by a sperm can be prevented.

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In barrier methods, ovum and sperm are prevented from physically meeting e.g. Condoms : They are made of thin rubber/latex sheath used to cover the penis in the male or vagina and cervix in the female just before coitus so that the ejaculated semen is not released in the female reproductive tract. Diaphragms, Cervical caps and Vaults: These are also made of rubber inserted into the female reproductive tract to cover the cervix during coitus. They prevent fertilization by blocking the entry of sperms through the cervix. Intra Uterine Devices (IUDs) : These devices are inserted by doctors in the uterus through vagina. These are available as non - medicated IUDs (Lippers loop), copper releasing IUDs (Cut, Cu7) and hormone releasing IUDs (LNG - 20). IUDs increase phagocytosis of sperms within the uterus and suppress sperm motility.
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