We have over expert writers with PhD and Masters level educations who are all ready to fulfill your writing needs no matter what the academic level or research topic. Hence, this period is called isometric contraction period 0.
Let us Follow Inner Ring First: In the first part of this period 0. At the onset of ventricular systole, the first sound occurs. But this statement is not exact, because, till the falling of intraventricular pressure goes below the intra-aortic pressure, the semilunar valves will not close.
All the other changes are subsidiary to them.
The blood columns in the aorta and pulmonary trunk try to roll back towards ventricles but are stopped by the sharp closure of the semilunar valves. They are completely filled up, the impulse from the S.
Thus the onset of filling period is marked by the third sound and its termination by the fourth sound. It has been noted that the cardiac cycle time is inversely proportional to heart rate. In the left half of the Fig.
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It is obvious that this phase corresponds with atrial systole. Although this is the longest phase of ventricular diastole, yet the amount of filling during this period is minimum. This produces the second sound of heart. Place your order now! In order to follow the march of events during the cardiac cycle and their interrelations, the Fig.
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