Medical Dictionary. arrhythmia. play. noun arÂ·rhythÂ·mia \Ä-Ërith-mÄ-É\. Medical Definition of arrhythmia. : an alteration in rhythm of the heartbeat either in time or force.
Central metabolism provides mechanisms for the generation of energy from carbon-energy source catabolism and the production of biosynthetic precursors and intermediates for the anabolic pathways essential to maintain cell structure and function.
Metabolism â all chemical reactions in a cell â arranged into metabolic pathways. Intermediates in these pathways are called metabolites. Catabolic reactions (e.g. respiration) release energy. Anabolic reactions (e.g. photosynthesis) use up energy.