The human small intestine is about 7 metres long.
Why it is true
The human small intestine is about 7 metres long, divided into the duodenum, jejunum and ileum. The villi inside increase the absorption surface to about 250 square metres, equivalent to a tennis court.
Source: Journal of Anatomy
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.