Researchers from the University of California in San Francisco revealed a mechanism which starts sperm swimming when they get near the egg could one day lead to new forms of male contraception.
According ti study findings, tiny pores on the sperm’s surface allow it to change its internal pH, which in turn starts its tail movements. Sperm do not start swimming from the moment of ejaculation - they have only limited resources, and to stand much chance of reaching the egg, need to delay their frantic dash until they are closer to the egg.
Researchers said the study might also explain why marijuana makes men infertile.
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