McCann, Mary B. Nutrition Program, Centers for Disease Control and Prevention, Health Services and Mental Health Administration, U.S. Department of Health, Education and Welfare, Rockville, Maryland.
Last reviewed:April 2019
Show previous versions
- Energy production and utilization
- Metabolic pathways
- Related Primary Literature
- Additional Reading
All the physical and chemical processes by which living, organized substance is produced and maintained, and the transformations by which energy is made available for use by an organism. Metabolism encompasses the biochemical processes by which foodstuffs, including carbohydrates, fats, and proteins, are synthesized into complex elements (assimilation and anabolism); complex substances are transformed into simple ones (disassimilation and catabolism); and energy is made available for use by an organism (Fig. 1). In defining metabolism, it is customary to distinguish between energy metabolism and intermediary metabolism, although the two are, in fact, inseparable. Energy metabolism is primarily concerned with overall heat production in an organism, whereas intermediary metabolism deals with chemical reactions within cells and tissues. In general, the term metabolism is interpreted to mean intermediary metabolism. See also: Amino acid metabolism; Carbohydrate; Carbohydrate metabolism; Energy metabolism; Fat and oil (food); Lipid metabolism; Protein
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information