Proteins in Diet .
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| protein metabolism . |
[1]. Foodstuffs containing high protein content are meat, fish, egg and milk.
[2]. Proteins are also available in wheat, soybeans, oats and various types of pulses.
[3]. Proteins present in common foodstuffs are:
1. Wheat: Glutenin and gliadin, which constitute gluten .
2. Milk: Casein, lactalbumin, albumin and myosin .
3. Egg: Albumin and vitellin . Cardiac Cycle| Various Event of Cardiac Cycle
4. Meat: Collagen, albumin and myosin.
Dietary proteins are formed by long chains of amino acids, bound together by peptide linkages.
Digestion of proteins .
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| Digestion of proteins . |
Enzymes responsible for the digestion of proteins are called proteolytic enzymes.
In the Mouth .
Digestion of proteins does not occur in mouth, since saliva does not contain any proteolytic enzymes. So, the digestion of proteins starts only in stomach .
you may also refer :- Excitability, Rhythmicity, Conductivity & Contractility properties of Cardiac Muscle
In the Stomach .
Pepsin is the only proteolytic enzyme in gastric juice . Rennin is also present in gastric juice. But it is absent in human.
In the small Intestine .
[1]. Most of the proteins are digested in the duodenum and jejunum by the proteolytic enzymes of the pancreatic juice and succus entericus.
[2]. Proteolytic Enzymes in Pancreatic Juice Pancreatic juice contains trypsin, chymotrypsin and carboxypeptidases.
[3]. Trypsin and chymotrypsin are called endopeptidases, as these two enzymes break the interior bonds of the protein molecules .
[4]. Proteolytic Enzymes in Succus Entericus Final digestion of proteins is by the proteolytic enzymes present in the succus entericus. It contains dipeptidases, tri-peptidases and aminopeptidases .
Final Products of Protein Digestion .
Final products of protein digestion are the amino acids, which are absorbed into blood from intestine.
Absorption of Proteins .
[1]. Proteins are absorbed in the form of amino acids from small 11intestine.
[2]. The levo amino acids are actively absorbed by means of sodium cotransport, whereas, the dextro-amino acids are absorbed by means of facilitated diffusion.
you may also refer :- Cardiovascular System| Heart| Blood Vessels| Division of Circulation.
[3]. Absorption of amino acids is faster in duodenum and jejunum and slower in ileum.
Metabolism of proteins .
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| protein metabolism . |
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