Privacy Policy. Skip to main content. Digestive System. Search for:. Absorption in the Small Intestine The absorption of nutrients occurs partially by diffusion through the wall of the small intestine.
Learning Objectives Describe the role played by the small intestine in the absorption of nutrients. Key Takeaways Key Points Digested food is able to pass into the blood vessels in the wall of the small intestine through the process of diffusion.
The inner wall, or mucosa, of the small intestine is covered in wrinkles or folds called plicae circulares that project microscopic finger-like pieces of tissue called villi, which in turn have finger-like projections known as microvilli. Each villus transports nutrients to a network of capillaries and fine lymphatic vessels called lacteals close to its surface.
Key Terms villi : Tiny, finger-like projections that protrude from the epithelial lining of the intestinal wall. Examples Examples of nutrients absorbed by the small intestine include carbohydrates, lipids, proteins, iron, vitamins, and water. Absorption of Monosaccharides, Amino Acids, Dipeptides, Tripeptides, Lipids, Electrolytes, Vitamins, and Water Glucose, amino acids, fats, and vitamins are absorbed in the small intestine via the action of hormones and electrolytes.
Learning Objectives Describe the process of absorption of nutrients in the small intestine. Key Takeaways Key Points Proteins are degraded into small peptides and amino acids di- and tripeptides before their absorption by proteolytic and digestive enzymes such as trypsin. Lipids fats are degraded into fatty acids and glycerol by pancreatic lipase. Carbohydrates are degraded into monosaccharide or oligosaccharide sugars by the action of amylase.
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Musculoskeletal System. Cloning and identification of a new member of water channel AQP10 as an aquaglyceroporin. Biochima et Biophysica Acta. The glucose transporter family: structure, function and tissue-specific expression. Biochem J. Structural basis for physiological regulation of paracellular pathways. J Membr Biol. The mechanisms of sodium absorption in the human small intestine. Contribution of solvent drag through intercellular junctions to absorption of nutrients by the small intestine.
Simultaneous determination of gastric emptying and intestinal absorption during cycle exercise. Modigliani R Bernier JJ. Absorption of glucose, sodium and water by the human jejunum studied by intestinal perfusion with a proximal occluding balloon and at variable flow rates. Glucose absorption from maltotriose and glucose oligomers in the human jejunum. Clin Sci. Further studies on the perfusion method for measuring intestinal absorption in man: the effects of the proximal occlusive balloon and a mixing segment.
The effect of osmolality on absorption from carbohydrate-electrolyte solutions CES in the human jejunal perfusion model. Intestinal absorption of sucrose in man: interrelation of hydrolysis and monosaccharide product absorption. Fructose transport mechanisms in humans. Wheeler K Banwell JG. Intestinal water and electrolyte flux of glucose-polymer electrolyte solutions. Grim E. Water and electrolyte flux rates in the duodenum, jejunum, ileum and colon and effects of osmolarity.
Am J Dig Dis. Changes in blood, plasma and red cell volume after ingestion of hypotonic and hypertonic solutions. Wapnir R Lifshitz F. Osmolality and solute concentration—their relationship with oral rehydration solution effectiveness: an experimental model. Pediatric Res. Dominant role for osmolality in the efficacy of glucose and glycine-containing oral rehydration solutions: studies in a rate model of secretory diarrhoea.
Acta Paediatr. Effect of beverage osmolality on intestinal fluid absorption during exercise. Intestinal fluid absorption during exercise: role of sport drink osmolality and [Na].
Curran PF. Ion transport in the intestine and its coupling to other transport processes. Mechanism of bicarbonate absorption and its relationship between sodium transport in the human jejunum. Water and solute absorption from hypotonic glucose-electrolyte solutions in human jejunum.
Passive movement of water and sodium across the small intestinal mucosa. Effect of sodium concentration in a carbohydrate-electrolyte solution on intestinal absorption.
The role if intraluminal sodium in glucose absorption in vivo. Effect of bicarbonate or base precursor on water and solute absorption from a glucose-electrolyte solution in the human jejunum. Cell-specific effects of luminal acid, bicarbonate, cAMP and carbachol on transporter trafficking in the intestine.
Jejunal water transport in man: effects of bicarbonate or tartrate. Fordtran JS Saltin B. Gastric emptying and intestinal absorption during prolonged severe exercise. Effects of hypohydration on gastric emptying and intestinal absorption during exercise. Effects of exercise intensity on absorption of ingested fluids. Exp Physiol. The kinetics of water absorption in the human intestine. Accumulation of deuterium oxide D 2 O in body fluids following ingestion of D 2 O-labelled beverages.
Unilateral fluid absorption and effects on peak power after ingestion of commercially available hypotonic, isotonic and hypertonic sports drinks. Human intestinal water absorption: direct vs indirect measurements. Gastric emptying, absorption, and carbohydrate oxidation during prolonged exercise. Edelman IS. Exchange of water between blood and tissues. Pinson EA. Water exchange and barriers as studied by the use of hydrogen isotopes. Physiol Rev. Plasma deuterium accumulation following ingestion of different carbohydrate beverages.
Appl Phys Nutr Metabol. Fluid availability of sports drinks differing in carbohydrate type and concentration. Total body water measurement in humans with 18 O and 2 H labeled water. Am J Clin Nutr ; 33 : — The use of deuterium tracer technique to follow the fate of fluids ingested by human subjects: effects of drink volume and tracer concentration and content. Halliday D Miller AG. Precise measurement of total body water using trace quantities of deuterium oxide.
Biomed Mass Spectrom. Comparison of water absorption from an ingested glucose electrolyte solution GES and potable water using a tracer technique in healthy volunteers.
Effect of carbohydrate and sodium content on fluid delivery. Nutr Metab. The effect of carbohydrate type, sodium and osmolality on unidirectional water uptake from ingested solutions in man. Effects of repeated ingestion of high and low glucose-electrolyte solutions and blood 2 H 2 O concentration after an overnight fast. Br J Nutr. Oxford University Press is a department of the University of Oxford.
It furthers the University's objective of excellence in research, scholarship, and education by publishing worldwide. Sign In or Create an Account. Sign In. Advanced Search. Search Menu. Article Navigation. Close mobile search navigation Article Navigation. Volume Article Contents Abstract. Fate of ingested fluids: factors affecting gastric emptying and intestinal absorption of beverages in humans. Leiper John B. Oxford Academic.
Cite Cite John B. Select Format Select format. Permissions Icon Permissions. Abstract The volume of fluid ingested for rehydration is essential in determining the restoration of euhydration because it must be in excess of the water lost since the individual was last euhydrated.
Table 1 Summary of the factors that affect the rate of gastric emptying of ingested beverages. Open in new tab. Figure 1. Open in new tab Download slide. Figure 2. Table 2 Summary of the factors that affect the rate of intestinal absorption of water from ingested beverages. Figure 3. Figure 4. Figure 5. Google Scholar Crossref.
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Citing articles via Web of Science Latest Most Read Most Cited A systematic review of supermarket automated electronic sales data for population dietary surveillance. Moderate hypotonicity of the luminal contents potentiates solute-induced water absorption while hypertonicity slows fluid absorption.
Dilute hypotonic glucose-sodium solutions are highly effective oral rehydration solutions, and the type of carbohydrate used does not appear to be important.
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