Friday, 31 August 2018

large intestine function in digestive system

Function of large intestine in digestion

The large intestine lack circular folds, villi, or microvilli and has the much smaller surface area. 

The small intestine joins the large intestine near a blind-ended sac, that is called
cecum.  The human cecum and its extension, the appendix, are storage sites and possibly represent evolutionary remains of a larger, functional cecum, such as is found in herbivores.

The appendix consist of greater number of lymphoid tissue and perform the function of immune system. The major functions of the large intestine contain the
reabsorption of water and minerals, and the formation and storage of feces. As peristaltic waves move food residue along, minerals diffuse or are actively transported from the residue across the epithelial surface of the large intestine into the bloodstream.

 Water follows osmotically and returns to the lymphatic system and bloodstream. When water reabsorption is insufficient, diarrhea results.
 If too much water is reabsorbed, fecal matter becomes too thick, resulting in

Many bacteria and fungi exist symbiotically in the large intestine. They feed on the food residue and further break down its organic molecules to waste products. Then they secrete amino acids and vitamin K, which the host’s gut absorbs. But
feces is a mixture of bacteria, fungi, undigested plant fiber, sloughed-off intestinal cells, and other waste products.


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