2024 CPPS 303 - Gastrointestinal 5 ( Coupling of Nutrient Digestion & Absorption ) Latest Questions With Complete Grade A Answers
- Macro-Nutrients (3)
Answer:
- Carbohydrates
- Proteins
- Lipids
- Digestion of Macronutrients
Answer: Must be digested before being absorbed
- Digestion -absorption coupling mechanism
- Enzymes are specific to nutrients
- Transport Channels are nutrient specific
- Sites of absorption for Carbs, proteins and lipids
Answer: Sm Intestine
- highest absorption rate in the duodenum and jejunum
- Sites of absorption for Iron and Folate
Answer: Duodenum
- Sites of absorption for Calcium
Answer: Sm Intestine
- Sites of absorption for Bile Acids
Answer: Recycling
- Distal Jejunum
- Ileum
- Ascending Colon
- Sites of absorption for Cobalamin (Vit B12)
Answer: Ileum
- General Mechanism for Simple Substrate Digestion
Answer: Required no digestion
- it is immediately absorbed
- ie) Glucose
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- General Mechanism for Protein Digestion
Answer: Luminal and Brush border digestion converts proteins into AAs
- General Mechanism for Carbohydrate Digestion
Answer: Luminal and Brush border digestion converts polymers into monomers
- ie) Sucrose
- General Mechanism for Peptide Digestion
Answer: Endocytosis and intracellular di- gestion
- ie) large oligopeptides
- General Mechanism for Lipid Digestion
Answer: Luminal Hydrolysis and intracellular re-synthesis
- Polysaccharides (2)
Answer: Starch (plants) and Glycogen (animals)
- Disaccharides (3)
Answer:
- Maltose
- Sucrose
- Lactose
- Monosaccharides (3)
Answer:
- Glucose
- Fructose
- Galactose
- Digestion of Carbohydrates
Answer: 2 stages
1) Luminal Digestion 2) Brush Border (Membrane) Digestion
- Oligosaccharides
Answer: Polymer of 2-10 monosaccharides
- What % of dietary carbs are starch and glycogen
Answer: 45%-60%
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