Sperm cells have a monumental task, but their days are numbered. From the moment they’re made in the testes to the time they may spend winding their way up the labyrinthine of the female reproductive tract, their internal clocks are ticking. So exactly how long do human sperm survive, in order to complete this journey?
The answer depends on where the sperm is and conditions such as temperature, moisture and energy levels. For instance, from the testes, they migrate up a narrow, coiled channel called the epididymis for up to 10 days, until they reach a reservoir at the end, where they await ejaculation.
Full story on Live Science.
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