What would you see if you peered inside a human small intestine? Here’s a glimpse at its structure, revealing a community of cells with different functions. A biopsy like this is generally very small ...

The (a) intestine, (b) esophagus and (c) stomach are shown. Quiescent stem cells (d) through asymmetric division probably give rise to more rapidly dividing active stem cells, which then produce ...

In the small intestine there are also specialised structures called villi which have a tiny hair-like structure poking into the small intestine to absorb digested food. If we stretched out all the ...