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Digestion and absorption process
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Small intestine
The secretions from the liver, gall bladder and pancreas are released into the small intestine
through a duct known as the common bile duct
The small intestine is 6-7m long with a diameter of about 3-4 cm and is accommodated inside the body in a highly coiled manner It is the longest organ of the digestive tract. It is divided into three segments duodenum, jejunum, and ileum.
The small intestine is the main organ of the digestive tract where the complete digestion of food and absorption of nutrients takes place. The chyme from the stomach that enters the small intestine is mixed with the pancreatic juice secreted by the pancreas, bile secreted by the liver and the intestinal juice secreted by the small intestine.
Absorption in the small intestine
The mucous lining of the small intestine has millions of finger-like projections known as vill The will are surrounded by blood capillaries. Their main function is to increase the surface area available for the absorption of nutrients from the digested food,
The simple soluble nutrients obtained from the digestion of food are absorbed by diffusion from the walls of the small intestine into the blood stream These nutrients are then carried to the different parts of the body by the blood. These substances are then absorbed and assimilated by the body cells and are used to produce energy for various activities The undigested food from the small intestine then passes into the large intestine
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The small intestine is a long, coiled organ in the digestive system. It receives secretions from the liver, gall bladder, and pancreas through the common bile duct. It consists of three segments: duodenum, jejunum, and ileum.
The small intestine is responsible for complete digestion of food and absorption of nutrients. Chyme from the stomach mixes with pancreatic juice, bile, and intestinal juice in the small intestine.
The mucous lining of the small intestine has finger-like projections called villi, which increase the surface area for nutrient absorption. Nutrients are absorbed into the bloodstream through the intestinal walls and carried to different parts of the body.
Undigested food moves from the small intestine to the large intestine.
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