The lower ten meters of the small intestine is called the ileum, and is 'terminated' at the ileocecal valve.
The large intestine also is composed from several parts.
I have never heard of 'sensitive upper area of small intestine', but here are the sections: Duodenum Jejunum Ileum
Duodenum: the upper chamber of the Small Intestine.
It increases the surface area of the inside of the intestine, this allows for more area where nutrients can be absorbed.
Microvilli are finger-like projections that increase the surface area in the small intestine.
The small intestine has small tiny projections called "villi". These projections increase the surface area for absorption. The large intestine however lacks these structures.
the cell lining of the small intestine is called villi and are small, finger-like projections that are used to increase surface area.
probably the duodenum
pancreatic duct
the lining of the small intestine has folds, and are covered with finger-like projections called villi, which are covered with thousands of micro-villi
finger like projections in small intestine are called villi to increase surface area for absorption of food in small intestine.
the villi are small finger-like creases on the small and large intestines. they are used to increase the area for absorption.
Small intestine
Vili are present to increase the surface area of the small intestine. This allows more digestion to happen in the small intestine.