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The ovum travels from the fimbral end of the oviduct towards the uterus and the sperms travel from vagina and the uterus into the oviduct also called Fallopian tubes. If oviducts are blocked then the sperms and ovum can not meet and hence the sperm can not fertilize the ovum.

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16y ago
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Q: How do blocked fallopian tubes prevent fertilization?
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