The first of three sections of the small intestine, the duodenum, produces large quantities of mucus to protect the intestinal lining from acid in the chyme. Measuring about 20 feet (6 meters ...

Did you know if you unfolded your intestines, they'd be taller than a giraffe? Yep, they form a digestive tube so lengthy it's got two sections. The so-called small intestine is about 22 feet long ...

Partially digested food arrives in the intestine from the stomach. Digested food is absorbed in the small intestine. This means that it passes through the wall of the small intestine and into the ...