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Ventricular systole induces self-contraction such that pressure in both left and right ventricles rises to a level above that in the two atrial chambers, thereby closing the tricuspid and mitral valves—which are prevented from inverting by the chordae tendineae and the papillary muscles. Which valves are closed during the lateRead More →

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The mitral and tricuspid valves, also known as the atrioventricular, or AV valves, open during ventricular diastole to permit filling. Late in the filling period the atria begin to contract (atrial systole) forcing a final crop of blood into the ventricles under pressure—see cycle diagram. Does aortic pressure decrease duringRead More →