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Transcript
CARDIAC CYCLE Cardiac Cycle Refers to pattern of ; Systole (contraction) Diastole (relaxation) Shown by the heart in one complete cycle On average this 1 cardiac cycle lasts 0.8 seconds (based on 75 bpm) Diastole Return of blood from venae cavae and pulmonary veins to atria Causes atrial volume of blood to increase Eventually atrial pressure > ventricular pressure = AV valves are pushed open Atrial systole Atria (R&L) contract simultaneously pushing remainder of blood into ventricles Ventricles are still in diastole and SL valves are closed Ventricular systole Contraction of ventricles and closure of AV valves. (‘lubb’) Blood pressure in ventricles > pressure in arteries = SL valves pushed open and blood pumped out of heart into aorta and pulmonary arteries. Diastole Higher pressure in arteries close SL valves again. (‘dupp’) Cardiac cycle repeats Heart Sounds Normal https://www.youtube.com/watch?v=xS3jX1FY G-M Murmur https://www.youtube.com/watch?v=qCG_xoS UA5k