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Digestion is the breakdown of large insoluble food compounds into small water-soluble components so that they can be absorbed into the blood plasma.In certain organisms, these smaller substances are absorbed through the small intestine into the blood stream.
The gastrointestinal tract (GI tract, digestive tract, alimentary canal) is the tract or passageway of the digestive system that leads from the mouth to the anus.The GI tract contains all the major organs of the digestive system, in humans and other animals, including the esophagus, stomach, and intestines.
Fungi digest organic matter outside their bodies as opposed to animals that digest their food inside their bodies. For humans, eating is more complex, but is typically an activity of daily living. Physicians and dieticians consider a healthful diet essential for maintaining peak physical condition.
Some pathogens are transmitted via ingestion, including viruses, bacteria, and parasites.Most commonly, this takes place via the faecal-oral route.An intermediate step is often involved, such as drinking water contaminated by faeces or food prepared by workers who fail to practice adequate hand-washing, and is more common in regions where untreated sewage is common.
Definition and classification Food is any substance consumed to provide nutritional support and energy to an organism . [ 2 ] [ 3 ] It can be raw, processed, or formulated and is consumed orally by animals for growth, health, or pleasure.
This definition was standardized by the Montreal Consensus in 2006. [20] Symptoms include a painful feeling in the middle of the chest and feeling stomach contents coming back up into the mouth. Other symptoms include chest pain, nausea, difficulty swallowing , painful swallowing , coughing, and hoarseness. [ 21 ]
Animal digest is a common ingredient used in pet foods. As defined by the Association of American Feed Control Officials , digest is produced by the chemical or enzymatic hydrolysis of clean animal tissue that has not undergone decomposition.
These products can then serve as the substrates for other bacteria in the anaerobic digest, and be converted into CO 2 and CH 4, which is an important step for the carbon cycle for removing organic fermentation products from anaerobic environments. [38]