Question

Explain absorption of digested products​

Answer 1

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Explanation:

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The mechanical and digestive processes have one goal: to convert food into molecules small enough to be absorbed by the epithelial cells of the intestinal villi. ... Although the entire small intestine is involved in the absorption of water and lipids, most absorption of carbohydrates and proteins occurs in the jejunum.

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Answer 2

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☢️absorption of food

❄️Most of the absorption of digested food takes place in the small intestine. The inner lining of the small intestine has millions of tiny finger-like projections called the villi. These projections increase the surface area of the small intestine for more efficient food absorption. Within these villi, the capillaries absorb nutrients from the digested products of proteins and carbohydrates and lead them into the blood stream......

Following are the mechanisms of absorption of various nutrients, minerals and water:

☢️Simple diffusion − Glucose, amino acid, electrolytes such as Cl− follow this method; depends upon concentration gradient

☢️Facilitated transport − Fructose and some amino acids are absorbed by this method. Absorption occurs with the help of carrier ion such as Na+.

☢️Active transport − Glucose, some amino acids, Na+ follow this method. Absorption is against concentration gradient. Thus, it requires energy.

☢️Fatty acids are insoluble; hence first broken into small droplets called micelle, which further reform into small protein-coated fat globule called chylomicron (in intestinal mucosa), which are then transported into lacteals in villi, which finally release them into blood stream.

Substances absorbed in mouth − Certain drugs are absorbed in blood capillaries, lining lower parts of tongue......

☢️Substances absorbed in stomach − water, simple sugars, alcohol

Substances absorbed in small intestine − almost all nutrients

☢️Maximum absorption occurs here.

Substances absorbed in large intestine − water, minerals, drugs

☢️Absorbed substances finally reach tissues where they are utilized. This process is called assimilation.

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