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The  cardiac cycle  is the performance of the  human heart  from the beginning of one heartbeat to the beginning of the next. It consists of two periods: one during which the heart muscle relaxes and refills with blood, called  diastole  ( / d aɪ ˈ æ s t ə l i / ), followed by a period of robust contraction and pumping of blood, dubbed  systole  ( / s ɪ s ˈ t ə l i / ). After emptying, the heart immediately relaxes and expands to receive another influx of blood  returning from  the lungs and other systems of the body, before again contracting to  pump blood to  the lungs and those systems. A normally performing heart must be fully expanded before it can efficiently pump again. Assuming a healthy heart and a typical rate of 70 to 75 beats per minute, each cardiac cycle, or heartbeat, takes about 0.8 seconds to complete the cycle. [2] Cardiac cycle Organisms Animalia * Biological system Circulatory system Health Beneficial Action Involuntary Method Blood is allowed to enter rel

The  heart  is a  muscular   organ  in most animals, which pumps  blood  through the  blood vessels  of the  circulatory system . [1] Blood provides the body with  oxygen  and  nutrients , as well as assisting in the removal of  metabolic wastes . [2]  In humans, the heart is located between the lungs, in the  middle compartment  of the  chest . [3] Heart The human heart Details System Circulatory Artery Aorta , [a]   pulmonary trunk  and right and left  pulmonary arteries , [b] right coronary artery ,  left main coronary artery [c] Vein Superior vena cava ,  inferior vena cava , [d] right and left  pulmonary veins , [e] great cardiac vein ,  middle cardiac vein ,  small cardiac vein ,  anterior cardiac veins [f] Nerve Accelerans nerve ,  vagus nerve Identifiers Latin cor Greek kardía (καρδία) MeSH D006321 TA A12.1.00.001 FMA 7088 Anatomical terminology [ edit on Wikidata ] Normal heart sounds Normal heart sounds as heard with a  stethoscope Proble