If you have microscopic tearing in the anal canal, why doesn’t your own faeces poison you?

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Very small tears in the delicate anal tissue are apparently a common problem in humans, obviously more so in certain groups than others. Whether they’re microscopic or severe enough to cause bleeding, why doesn’t the faecal matter enter the blood stream and make you very ill? If you ate faeces you’d get gastroenteritis I assume, so wouldn’t faecal matter in the blood be really dangerous?

In: Biology