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Subscribe and 🔔 to OFFICIAL BBC YouTube 👉 https://bit.ly/2IXqEIn Stream original BBC programmes FIRST on BBC iPlayer 👉 https://bbc.in/2J18jYJ Spectacular sequence of woman's immune system killing sperm in cervix from episode one of Inside the Human Body. Inside the Human Body | Series 1 Episode 1: Creation | BBC #InsidetheHumanBody #BBCInsidetheHumanBody #BBC All our TV channels and S4C are available to watch live through BBC iPlayer, although some programmes may not be available to stream online due to rights. If you would like to read more on what types of programmes are available to watch live, check the 'Are all programmes that are broadcast available on BBC iPlayer?' FAQ 👉 https://bbc.in/2m8ks6v.