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Other dietary sugars such as sucrose and lactose (both disaccharides) are broken down further by different carbohydrase enzymes. NOTE: Ita€™s important you recall the main digestive enzymes, the food types they break down and where they are produced.
To digest food properly, especially cooked food, the body first releases ptyalin in the mouth as you chew food. This extraordinary plant-based enzyme formula supports the intestinal brush border cells to promote more complete digestion of carbohydrates and protein. Digestase is important for those who used antibiotics for three months or more, or who want more specific immune support. Beware of “junk” enzyme supplements.  Digestive enzymes used in commercial digestive products can vary widely in quality. On the other hand, if enzymes are extracted from a plant source such as fungi (usually Aspergillus), they may be free from pesticides and hormones, but they may contain remnant fungal residues, which itself can be immune compromising. Secondly, some plant enzyme products may be too highly heated in their extraction process, resulting in damaged, inactive enzymes. About UsWe provide comprehensive, quantum-state, multiple super nutrient formulas, all from once-living sources that contain a "body of light" to support optimal heatlh.
Large food molecules (for example, proteins, lipids, nucleic acids, and starches) must be broken down into subunits that are small enough to be absorbed by the lining of the alimentary canal.
In the small intestine, pancreatic amylase does the ‘heavy lifting’ for starch and carbohydrate digestion ([link]). The digestion of protein starts in the stomach, where HCl and pepsin break proteins into smaller polypeptides, which then travel to the small intestine ([link]).
The three lipases responsible for lipid digestion are lingual lipase, gastric lipase, and pancreatic lipase.
The mechanical and digestive processes have one goal: to convert food into molecules small enough to be absorbed by the epithelial cells of the intestinal villi.
Absorption can occur through five mechanisms: (1) active transport, (2) passive diffusion, (3) facilitated diffusion, (4) co-transport (or secondary active transport), and (5) endocytosis. Because the cell’s plasma membrane is made up of hydrophobic phospholipids, water-soluble nutrients must use transport molecules embedded in the membrane to enter cells. In contrast to the water-soluble nutrients, lipid-soluble nutrients can diffuse through the plasma membrane.
Active transport mechanisms, primarily in the duodenum and jejunum, absorb most proteins as their breakdown products, amino acids.
The large and hydrophobic long-chain fatty acids and monoacylglycerides are not so easily suspended in the watery intestinal chyme. The free fatty acids and monoacylglycerides that enter the epithelial cells are reincorporated into triglycerides.
The products of nucleic acid digestion—pentose sugars, nitrogenous bases, and phosphate ions—are transported by carriers across the villus epithelium via active transport. The electrolytes absorbed by the small intestine are from both GI secretions and ingested foods. In general, all minerals that enter the intestine are absorbed, whether you need them or not.
Iron—The ionic iron needed for the production of hemoglobin is absorbed into mucosal cells via active transport.
Bile salts and lecithin can emulsify large lipid globules because they are amphipathic; they have a nonpolar (hydrophobic) region that attaches to the large fat molecules as well as a polar (hydrophilic) region that interacts with the watery chime in the intestine. Intrinsic factor secreted in the stomach binds to the large B12 compound, creating a combination that can bind to mucosal receptors in the ileum. TOK: This is an example of a paradigm shift, where existing ideas about the tolerance of bacteria to stomach acid were incorrect but persisted for a time despite the evidence. Aim 7: Data logging with pH sensors and lipase, and data logging with colorimeters and amylase can be used.
Proteins are long chains of amino acids, and protease enzymes break them into peptides (smaller chains of amino acids molecules) and eventually into individual amino acids, which are small and easily absorbed in the small intestine. It digests complex fat (or lipid) molecules into simple, soluble fatty acid and glycerol molecules. Next, as the food enters the stomach, the stomach secretes Hydrochloric acid (HCL) and pepsin to continue breaking down the food.  Then, the food travels to the small intestines, where it will spend several hours being digested.
If the enzymes in a product have originated from an animal, its potency may be highly variable.  In addition, animal-source enzymes may contain toxic tagalongs such as pesticides and synthetic hormone residues. Glucose, galactose, and fructose are the three monosaccharides that are commonly consumed and are readily absorbed.
After amylases break down starch into smaller fragments, the brush border enzyme ?-dextrinase starts working on ?-dextrin, breaking off one glucose unit at a time. Chemical digestion in the small intestine is continued by pancreatic enzymes, including chymotrypsin and trypsin, each of which act on specific bonds in amino acid sequences.


The most common dietary lipids are triglycerides, which are made up of a glycerol molecule bound to three fatty acid chains.
However, because the pancreas is the only consequential source of lipase, virtually all lipid digestion occurs in the small intestine. Two types of pancreatic nuclease are responsible for their digestion: deoxyribonuclease, which digests DNA, and ribonuclease, which digests RNA. As you will recall from Chapter 3, active transport refers to the movement of a substance across a cell membrane going from an area of lower concentration to an area of higher concentration (up the concentration gradient).
Moreover, substances cannot pass between the epithelial cells of the intestinal mucosa because these cells are bound together by tight junctions. Once inside the cell, they are packaged for transport via the base of the cell and then enter the lacteals of the villi to be transported by lymphatic vessels to the systemic circulation via the thoracic duct.
The small intestine is highly efficient at this, absorbing monosaccharides at an estimated rate of 120 grams per hour. Bile salts not only speed up lipid digestion, they are also essential to the absorption of the end products of lipid digestion. However, bile salts and lecithin resolve this issue by enclosing them in a micelle, which is a tiny sphere with polar (hydrophilic) ends facing the watery environment and hydrophobic tails turned to the interior, creating a receptive environment for the long-chain fatty acids. The triglycerides are mixed with phospholipids and cholesterol, and surrounded with a protein coat.
Since electrolytes dissociate into ions in water, most are absorbed via active transport throughout the entire small intestine. Once inside mucosal cells, ionic iron binds to the protein ferritin, creating iron-ferritin complexes that store iron until needed. When blood levels of ionic calcium drop, parathyroid hormone (PTH) secreted by the parathyroid glands stimulates the release of calcium ions from bone matrices and increases the reabsorption of calcium by the kidneys. Fat-soluble vitamins (A, D, E, and K) are absorbed along with dietary lipids in micelles via simple diffusion.
Chemical digestion breaks large food molecules down into their chemical building blocks, which can then be absorbed through the intestinal wall and into the general circulation.
The story of how the Australians Robin Warren and Barry Marshall made the discovery and struggled to convince the scientific and medical community is well worth telling. Chemical digestion, on the other hand, is a complex process that reduces food into its chemical building blocks, which are then absorbed to nourish the cells of the body ([link]).
At the same time, the cells of the brush border secrete enzymes such as aminopeptidase and dipeptidase, which further break down peptide chains. Pancreatic lipase breaks down each triglyceride into two free fatty acids and a monoglyceride. The nucleotides produced by this digestion are further broken down by two intestinal brush border enzymes (nucleosidase and phosphatase) into pentoses, phosphates, and nitrogenous bases, which can be absorbed through the alimentary canal wall.
Each day, the alimentary canal processes up to 10 liters of food, liquids, and GI secretions, yet less than one liter enters the large intestine.
In this type of transport, proteins within the cell membrane act as “pumps,” using cellular energy (ATP) to move the substance.
Thus, substances can only enter blood capillaries by passing through the apical surfaces of epithelial cells and into the interstitial fluid. The absorption of most nutrients through the mucosa of the intestinal villi requires active transport fueled by ATP.
All normally digested dietary carbohydrates are absorbed; indigestible fibers are eliminated in the feces. Short-chain fatty acids are relatively water soluble and can enter the absorptive cells (enterocytes) directly.
During absorption, co-transport mechanisms result in the accumulation of sodium ions inside the cells, whereas anti-port mechanisms reduce the potassium ion concentration inside the cells.
When the body has enough iron, most of the stored iron is lost when worn-out epithelial cells slough off. PTH also upregulates the activation of vitamin D in the kidney, which then facilitates intestinal calcium ion absorption. This is why you are advised to eat some fatty foods when you take fat-soluble vitamin supplements. Intestinal brush border enzymes and pancreatic enzymes are responsible for the majority of chemical digestion. With the help of bile salts and lecithin, the dietary fats are emulsified to form micelles, which can carry the fat particles to the surface of the enterocytes.
In this section, you will look more closely at the processes of chemical digestion and absorption. Your bodies do not produce enzymes that can break down most fibrous polysaccharides, such as cellulose. The fatty acids include both short-chain (less than 10 to 12 carbons) and long-chain fatty acids.


Almost all ingested food, 80 percent of electrolytes, and 90 percent of water are absorbed in the small intestine. Passive diffusion refers to the movement of substances from an area of higher concentration to an area of lower concentration, while facilitated diffusion refers to the movement of substances from an area of higher to an area of lower concentration using a carrier protein in the cell membrane. Water-soluble nutrients enter the capillary blood in the villi and travel to the liver via the hepatic portal vein. The monosaccharides glucose and galactose are transported into the epithelial cells by common protein carriers via secondary active transport (that is, co-transport with sodium ions). Despite being hydrophobic, the small size of short-chain fatty acids enables them to be absorbed by enterocytes via simple diffusion, and then take the same path as monosaccharides and amino acids into the blood capillary of a villus. Without micelles, lipids would sit on the surface of chyme and never come in contact with the absorptive surfaces of the epithelial cells. After being processed by the Golgi apparatus, chylomicrons are released from the cell ([link]). To restore the sodium-potassium gradient across the cell membrane, a sodium-potassium pump requiring ATP pumps sodium out and potassium in. When the body needs iron because, for example, it is lost during acute or chronic bleeding, there is increased uptake of iron from the intestine and accelerated release of iron into the bloodstream. Most water-soluble vitamins (including most B vitamins and vitamin C) also are absorbed by simple diffusion. Water absorption is driven by the concentration gradient of the water: The concentration of water is higher in chyme than it is in epithelial cells.
Bile molecules have a hydrophilic end and a hydrophobic end, and thus prevent lipid droplets coalescing.
While indigestible polysaccharides do not provide any nutritional value, they do provide dietary fiber, which helps propel food through the alimentary canal. Although the entire small intestine is involved in the absorption of water and lipids, most absorption of carbohydrates and proteins occurs in the jejunum. Co-transport uses the movement of one molecule through the membrane from higher to lower concentration to power the movement of another from lower to higher. The monosaccharides leave these cells via facilitated diffusion and enter the capillaries through intercellular clefts. Short chains of two amino acids (dipeptides) or three amino acids (tripeptides) are also transported actively. Too big to pass through the basement membranes of blood capillaries, chylomicrons instead enter the large pores of lacteals.
Since women experience significant iron loss during menstruation, they have around four times as many iron transport proteins in their intestinal epithelial cells as do men. The fats are then reassembled into triglycerides and mixed with other lipids and proteins into chylomicrons that can pass into lacteals.
Finally, endocytosis is a transportation process in which the cell membrane engulfs material.
The monosaccharide fructose (which is in fruit) is absorbed and transported by facilitated diffusion alone. However, after they enter the absorptive epithelial cells, they are broken down into their amino acids before leaving the cell and entering the capillary blood via diffusion.
Intrinsic factor secreted in the stomach binds to vitamin B12, preventing its digestion and creating a complex that binds to mucosal receptors in the terminal ileum, where it is taken up by endocytosis. Other absorbed monomers travel from blood capillaries in the villus to the hepatic portal vein and then to the liver. The need for lipase to be water-soluble and to have an active site to which a hydrophobic substrate binds should be mentioned. By the time chyme passes from the ileum into the large intestine, it is essentially indigestible food residue (mainly plant fibers like cellulose), some water, and millions of bacteria ([link]).
The monosaccharides combine with the transport proteins immediately after the disaccharides are broken down.
The chylomicrons are transported in the lymphatic vessels and empty through the thoracic duct into the subclavian vein of the circulatory system.
Once in the bloodstream, the enzyme lipoprotein lipase breaks down the triglycerides of the chylomicrons into free fatty acids and glycerol.
These breakdown products then pass through capillary walls to be used for energy by cells or stored in adipose tissue as fat.
Liver cells combine the remaining chylomicron remnants with proteins, forming lipoproteins that transport cholesterol in the blood.



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