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education/nutrition/Proteins.md
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@ -99,3 +99,19 @@ Summary:
- Serious illness - Serious illness
- Blood losses - Blood losses
- Burns - Burns
# Digestion
- Protein digestion begins in the stomach
- Hydrochloric acid denatures food proteins and activates pepsin
- Gastric enzymes that break proteins down into smaller polypeptides
- After polypeptides enter the small intestine, the pancreas secretes protein splitting enzymes.
- Trypsin and chymotrypsin
- Enzymes released by absorptive cells break down shortened peptides into dipeptides and tripeptides
- Two and three amino acids respectively
- Amino acids are carried to absorptive cells by carrier systems
- After absorption, amino acids enter the capillary of villus
- Travel to liver via hepatic portal vein
- Liver keeps some amino acids
- Release the rest into circulation
- Protein turnover is the cellular process of breaking down proteins and recycling their amino acids.
- Endogenous is a source of nitrogen