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.
The body then burns this converted energy to maintain the survival of the living organism. The enzymes break proteins down into amino acids, fats into fatty acids and carbohydrates into simple sugars. The chemical reactions that occur in metabolism are caused by the secretion of hormones by the endocrine glands. The endocrine glands are ductless glands which secrete hormones directly into the blood stream, which are then carried to the different cells via the bloods plasma.