Facts about Proteins
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Facts about Proteinsby Cal |
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| What are proteins important for? | Biosynthesis of enzymes, structural proteins, and immunoglobulins |
| Where does protein digestion and absorption begin? | Stomach, but only a portion of digestion occurs there |
| Most protein digestion is due to the action of: | Pancreatic proteases that are activated by enterokinase produced in the duodenal mucosa |
| Where in the small intestine are proteins absorbed? | Any portion of the small intestine; thus clinically significant protein malabsorption is relatively infrequent, even after extensive intestinal resection |
| Where is the main site of protein turnover? | GI tract - sheds enterocytes and secretes digestive enzymes |
| In which situations is protein turnover increased? | Excessive GI tract losses, partial or full thickness skin burns, and draining wounds |
| How does protein turn over change with age? | Protein turnover decreases with age, from 25 g/kg/day in the neonate to 3 g/kg/day in the adult |
| What is the daily protein turnover in a 70 kg person? | 3% of total body protein |
| What is the total body protein in a 70 kg person? | Approximately 10-11 kg |
| In the average healthy adult, what is the daily protein requirements? | 0.8 g/kg body weight. In the US, the usual intake per day is twice this amount. |
| Each gram of protein provides how many kcals of energy? | 4 kcal |
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