Compare and contrast the structure and function of small and large intestines.

Small intestines is longer (around 6m) and its luminal surface area is grossly expanded using villi and microvilli. It is the main site of action of digestive enzymes, most of which are produced by the pancreas and drain into the proximal part of small intestine called the duodenum. Compared to small intestine, large intestine is much shorter and wider. It's mucosa lacks microvilli and mainly functions in water reabsorption and stool compaction.