the process of decomposing organic matter (as in sewage) by bacteria or by chemical action or heat
the organic process by which food is converted into substances that can be absorbed into the body
learning and coming to understand ideas and information
"his appetite for facts was better than his digestion"
The process, in the gastrointestinal tract, by which food is converted into substances that can be utilized by the body.
The result of this process.
The ability to use this process.
The processing of decay in organic matter assisted by microorganisms.
The assimilation and understanding of ideas.
the act or process of digesting; reduction to order; classification; thoughtful consideration
the conversion of food, in the stomach and intestines, into soluble and diffusible products, capable of being absorbed by the blood
generation of pus; suppuration
Origin: [F. digestion, L. digestio.]
Digestion is the mechanical and chemical breakdown of food into smaller components that are more easily absorbed into a blood stream, for instance. Digestion is a form of catabolism: a breakdown of large food molecules to smaller ones. When food enters the mouth, digestion of the food starts by the action of mastication, a form of mechanical digestion, and the wetting contact of saliva. Saliva, a liquid secreted by the salivary glands, contains salivary amylase, an enzyme which starts the digestion of starch in the food. After undergoing mastication and starch digestion, the food will be in the form of a small, round slurry mass called a bolus. It will then travel down the esophagus and into the stomach by the action of peristalsis. Gastric juice in the stomach starts protein digestion. Gastric juice mainly contains hydrochloric acid and pepsin. As these two chemicals may damage the stomach wall, mucus is secreted by the stomach, providing a slimy layer that acts as a shield against the damaging effects of the chemicals. At the same time protein digestion is occurring, mechanical mixing occurs by peristalsis, which are waves of muscular contractions that move along the stomach wall. This allows the mass of food to further mix with the digestive enzymes. After some time, the resulting thick liquid is called chyme. When the pyloric sphincter valve opens, chyme enters the duodenum where it mixes with digestive enzymes from the pancreas, and then passes through the small intestine, in which digestion continues. When the chyme is fully digested, it is absorbed into the blood. 95% of absorption of nutrients occurs in the small intestine. Water and minerals are reabsorbed back into the blood in the colon where the pH is slightly acidic about 5.6 ~ 6.9. Some vitamins, such as biotin and vitamin K produced by bacteria in the colon are also absorbed into the blood in the colon. Waste material is eliminated from the rectum during defecation.
U.S. National Library of Medicine
The process of breakdown of food for metabolism and use by the body.
The numerical value of digestion in Chaldean Numerology is: 6
The numerical value of digestion in Pythagorean Numerology is: 3
Images & Illustrations of digestion
Translations for digestion
From our Multilingual Translation Dictionary
- πέψη, χώνεψη, αποσύνθεση, αφομοίωσηGreek
- digestión, descomposición, asimilación, putrefacciónSpanish
- hajottaminen, ruoansulatus, ruuansulatusFinnish
- meirbheadhScottish Gaelic
- decomposizione, digestione, assimilazioneItalian
- vertering, verwerven, verwerving, verteren, assimilatie, spijsverteringDutch
- fordøying, melting, matmeltingNorwegian Nynorsk
- пищеварение, перевариваниеRussian
- варење, varenjeSerbo-Croatian
- జీర్ణము, హరాయించుకొనుTelugu
- hệ tiêu hóaVietnamese
- dicetam, dicetVolapük
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