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10 Cards in this Set
- Front
- Back
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Epicardium |
Outer layer of the heart wall. Visceral layer of serous pericardium on external surface of heart |
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Endocardium |
Inner most layer of heart-is continuous with endothelial lining of blood vessels Lines heart chambers and covers cardiac skeleton of valves |
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Fibrillation |
Rapid, irregular, and in synchronized contraction of muscle fibers (e.g. two major classes of cardiac fibrillation: Atrial fibrillation (A-fib) and Ventricular fibrillation (V-fib) |
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Ectopic Focus |
Excitable group of cells that cause a premature heartbeat outside of the normally functioning SA node of the heart |
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Electrocardiogram |
A graphic recording of electrical activity of impulses moving through the heart |
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Systole |
Period of heart contraction The phase of the heartbeat when the heart muscle contracts and pumps blood from chambers into arteries |
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Diastole |
Period of heart relaxation The phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood |
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Heart murmur |
Abnormal heart sounds heard when blood hits obstructions Usually indicates valve problems |
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Cardiac output |
Volume of blood pumped by each ventricle in 1 minute CO = Heart rate x stroke volume (Normal 5.25 L/min) |
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Stroke volume |
Volume of blood pumped out by one ventricle with each beat (3 main factors affecting SV) •Preload •Contractility •Afterload |
