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Digestion usually involves mechanical manipulation and chemical action. In most vertebrates, digestion is a multi-stage process in the digestive system, following ingestion of the raw materials, most often other organisms. The process of ingestion usually involves some type of mechanical manipulation.

1 Human digestion

In humans, digestion begins in the mouth where food is chewed with the teeth. The process stimulates exocrine glands in the mouth to release digestive enzymes such as salivary amylase , which aid in the breakdown of food, particularly carbohydrates. Chewing also causes the release of saliva, which helps condense food into a bolus that can be easily passed through the esophagus to the stomachIn anatomy, the stomach is an organ in the alimentary canal used to digest food. Generally, the stomach's primary function is not the adsorption of nutrients from digested food; this task is usually performed by the intestine. Latin names for the stomach. In the stomach, food is churned and thoroughly mixed with acidFor alternative meanings see acid (disambiguation). An acid (represented by the generic formula AH is typically a water-soluble, sour-tasting chemical compound. An acid always has a pH of less than 7. It is a molecule or ion that contains hydrogen or that and other digestive enzymes to further decompose it chemically. As the acidic levelAlternate uses: see Ph pH (potential (of) hydrogen) is a measure of the concentration of hydrogen ions (H+) in a solution and, therefore, its acidity or alkalinity. The concept was introduced by S. Sorensen in 1909. The p stands for the German potenz mean changes in the stomach and later parts of the digestive tract, more enzymes are activated or deactivated to extract and process various nutrients.

After being processed in the stomach, food is passed to the small intestineIn biology the small intestine is the part of the gastrointestinal tract between the stomach and the large intestine. In humans over 5 years old it is about 7m long. It is divided into three structural parts: duodenum, jejunum and ileum . Food from the st where it is further mixed with secretions such as bileBile (or gall is a bitter, greenish-yellow alkaline fluid secreted by the liver of many vertebrates. It is stored in the gallbladder between meals and upon eating is discharged into the duodenum where it aids the process of digestion. Bile salts act to so, which helps aid in fatThis article is about lipid molecules, for FAT see File Allocation Table. In biochemistry, fat is a generic term for a class of lipids. Fats are produced by organic processes in animals and plants. All fats are insoluble in water and have a density signif digestion, and insulincarbon; green: oxygen; blue: nitrogen; pink: sulphur. The blue/purple ribbons denote the skeleton [-N-C-C-]n in the protein's amino acid sequence H-[-NH-CHR-CO-]n-OH where R is the part protruding from the skeleton in each amino acid. Insulin ( Latin insu, to process sugarThis article deals with sugar as food and as an important, widely traded commodity; the word also has other uses; see Sugar (disambiguation A sugar is a form of carbohydrate; the most commonly used sugar is a white crystalline solid, sucrose; used to altes. Most nutrient absorption takes place in the small intestine, after which food is passed to the large intestine. Blood which has absorbed nutrients passes through the liver for filtering, removal of toxins and help processing of nutrients. In the large intestine, water is reabsorbed, and leftover waste is excreted by defecation.