The Ultimate Survival of the Fittest - 250 Million Start the Race, All Will Die but One
Sperm go on the most amazing journey, one we take for granted. From the moment sperm leaves the male body, the vagina does everything it can to try and kill it.
Over 1000 sperm roll off the production line every heartbeat and 250 million leave the male body at ejaculation. It's a big race with only one penetrating the egg.
See how the race of the winning sperm unfolds below in our infographic.
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Read the full story: The Journey Of Sperm by Professor Allan Pacey.