Assimilation (biology)

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Biological assimilation, or bioassimilation, involves one of two different processes to supply animal cells with nutrients. The first is the process of absorbing vitamins, minerals, and other chemicals from food within the gastrointestinal tract. In humans this is done with a chemical breakdown (enzymes and acids) and physical breakdown (oral mastication and stomach churning.) The second process of bioassimilation is the chemical alteration of substances in the bloodstream by the liver or cellular secretions. Although many similar compounds can be absorbed in digestion bioassimilation, the bioavailability of many compounds is dictated by this second process since both the liver and cellular secretions can be very specific in their metabolic action (see chirality (chemistry).)

Most foods are composed of largely indigestible components depending on the enzymes and effectiveness of an animals digestive tract. The most well known of these indigestible compounds is cellulose; the basic chemical polymer in the makeup of plant cell walls. Most animals, however, do not produce cellulase; the enzyme needed to digest cellulose. However some animal species have developed symbiotic relationships with cellulase producing bacteria (see termites and metamonads.) This allows termites to use the energy dense cellulose carbohydrate. ^[1] These enzymes improve the overall bioassimilation in the digestive tract but are still not proven to increase bloodstream bioavailability. Basically the enzymes and other breakdowns make the bigger substances of food smaller so they can go through the rest of their digestion more easily.

Contents 1 Examples of biological assimilation 2 References 3 See also 4 Citations

[edit] Examples of biological assimilation

• Photosynthesis, a process whereby carbon dioxide and water are transformed into a number of organic molecules in plant cells.
• Nitrogen fixation from the soil into organic molecules by symbiotic bacteria which live in the roots of certain plants, such as Leguminosae.
• Magnesium supplements orotate, oxide, sulfate, citrate, and glycerate are all structurally similar. However, oxide and sulfate are not water soluble and do not enter the blood stream while orotate and glycerate have Normal exiguous liver conversion. Chlorophyll sources or magnesium citrate are highly bioassimilable.

• The absorption of nutrients into the body after digestion in the intestine and its transformation in biological tissues and fluids.
• Assimilation is occurring in every cell of the body to help develop new cells.

[edit] References

1. ^ Other such enzymes are known to significantly improve bioassimilation of nutrients. Because of the use of bacterial derivatives enzymatic dietary supplements now contain such enzymes as Amylase, Glucoamylase, Protease, Invertase, Peptidase, Lipase, Lactase, Phytase, and Cellulase.<ref></ol></ref>

   [edit] See also

   • Anabolism
   • Biochemistry
   • Bioavailability

   [edit] Citations

   Longman Biology for IGCSE

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