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.
A common theme in the metabolism of biomolecules, especially for those which are used as primary sources of energy (i.e. carbohydrates and fat), is the existence of pathways for catabolism and anabolism (biosynthesis).