tricarboxylic acid cycle

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Definition of tricarboxylic acid cycle in English English dictionary

An alternative name for the Krebs cycle

or Krebs cycle or citric-acid cycle Last stage of the chemical processes by which living cells obtain energy from foodstuffs. Described by Hans Adolf Krebs in 1937, the reactions of the cycle have been shown in animals, plants, microorganisms, and fungi, and it is thus a feature of cell chemistry shared by all types of life. It is a complex series of reactions beginning and ending with the compound oxaloacetate. In addition to re-forming oxaloacetate, the cycle produces carbon dioxide and the energy-rich compound ATP. The enzymes that catalyze each step are located in mitochondria in animals, in chloroplasts in plants, and in the cell membrane in microorganisms. The hydrogen atoms and electrons that are removed from intermediate compounds formed during the cycle are channeled ultimately to oxygen in animal cells or to carbon dioxide in plant cells

{i} Krebs cycle, citric acid cycle, sequence of chemical reactions of utmost significance in all living aerobic organisms that use oxygen as part of cellular respiration

Hyphenation

tricarboxylic ac·id cy·cle