The small intestine is also super thin, just one and 1/2 to two inches around, almost the diameter of a golf ball, yet its surface is massive. If you flattened it out, it would be about the size ...

2011;68(23):2241-2247. Surface area for drug absorption The villi and microvilli responsible for the vast absorptive surface in the small intestine are of highest concentration in the duodenum ...

But the ways in which changes in the microbiome result in changes in the functioning of the intestinal cells are still unclear. The microbiome of the small intestine is distinct from the colon ...