2/3. Packed away inside the abdomen, the intestines take up little space, but rolled out, their surface area would cover two tennis courts. Geoff Watts finds out how the body defends this huge area from attack by bacteria. Producer Michelle Martin
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2/3. Packed away inside the abdomen, the intestines take up little space, but rolled out, their surface area would cover two tennis courts. Geoff Watts finds out how the body defends this huge area from attack by bacteria. Producer Michelle Martin
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