21. Here the stable 2-systole of a Riemannian manifold " M " is defined by setting 22. Where " sys " is its systole , i . e . least length of a noncontractible loop. 23. Consequently, this initial phase of ventricular systole is known as isovolumic contraction, also called isovolumetric contraction. 24. The increased blood volume in the right ventricle causes the pulmonic valve to stay open longer during ventricular systole . 25. The actual term " systole " itself was not coined until a quarter century later, by Marcel Berger. 26. For example, at the end of diastole the annular area is smaller than at the end of systole . 27. During systole , when blood volume increases in the finger, the PID-controller increases the control point. 28. Atrial systole lasts approximately 100 ms and ends prior to ventricular systole, as the atrial muscle returns to diastole. 29. Atrial systole lasts approximately 100 ms and ends prior to ventricular systole , as the atrial muscle returns to diastole. 30. Most bruits occur only in systole , so the bruit is intermittent and its frequency dependent on the heart rate.
