Function of Small Intestine | Mechanical Functions of Intestine

  1. Function of Small Intestine 
  2. Mechanical Functions of Intestine
  3. Biochemical Functions of Intestine

Both structure and function can be described as a complete anatomy and at a microscopic level. The bowel region can be broadly divided into two distinct parts, the small and large intestine. The diameter of the brown-violet small intestine in an adult is about 35 millimeters (1.5 in) and the average length is 6 to 7 m (20–23 ft). The large intestine of dark red color is small and relatively thick, with an average length of about 1.5 m (5 ft). Individuals will have bowels of different sizes according to size and age.

Function of Small Intestine

Digestion of food and digestion of digested substances occurs mainly in the small intestine. And for this small intestine is well adapted. It itself is very long.

Then the inner surface of its wall is about 600 times enlarged, due to the inner circular pimples of its wall, the succulents of the mucosa and the microspheres of the cells of the mucous membrane. Therefore, the total area of ​​this surface is about 250 square meters.

Mechanical Functions of Intestine

As soon as the first batch of chyme reaches the duodenum from the stomach, there is a percussion in the wall of the duodenum. And the ringed waves of peristalsis start to flow through the entire intestine wall. Therefore, the entire intestine starts to look beaded, like a chanting.

These waves push the chime forward into the intestine. In these waves about 12 to 16 times per minute, the points of oscillation change. The chyme is divided into small bodies repeatedly – it gets mixed well with the digestive juices released in the intestine. [Function of Small Intestine] That is why these waves of intermittent movements occurring in the middle of peristalsis are called mixing or coherent motions.

Peristalsis is relatively intense in the proximal part of the small intestine and somewhat slower in the distal part. The peristalsis and mixing motions of the intestine are regulated by local reflexes. Which depends on the spread of the duodenal wall, concentration and pH of the chyme and the amount of amino acids and proteins in the chyme. 

Function of Small Intestine

Biochemical Functions of Intestine

Digestive Functions: The salivary amylase enzyme cleaves some malt into maltose. The lipase enzyme of saliva and gastric juice cleaves some simple fats, i.e. triglycerides, into fatty acids and monoglycerides. 

Pepsin of gastric juice breaks down enzyme proteins into small peptides. Thus, the chyme that reaches the small intestine contains some incompletely digested carbohydrates, fats, and proteins. There are three digestive juices in the whole digestive process, pancreatic juice, bile and intestinal juice. 

Upon reaching the duodenum of chyme, the first pancreatic duct in the duodenum is released by the pancreatic juice. [Function of Small Intestine] After this, the bile and pancreatic juice in the duodenum are freed together with the liver-pancreatic tuberculosis. Soon the intestinal juice secreted by the intestinal glands also gets released in the cavity of the intestine.

[Function of Small Intestine]

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