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 circulatory system includes the heart, blood vessels, and regulatory controls (such as the autonomic nervous system, catecholamines, and hormones). Its main function is to deliver oxygen and substrate (glucose) to cells. The circulatory system also transports byproducts of cellular metabolismâ66% in the form of carbon dioxide (CO2) to the lungs and the remaining 33% to the kidneys as breakdown products of protein metabolism.