8 out of 12
Starling’s principle is: (DNB Jun-2007)
|A||Muscle fiber length does not affect contraction|
|B||Contraction is proportional to blood flow|
|C||Within physiological limits, the force of contraction is proportional to initial length of cardiac muscle fiber|
|D||Energy of contraction is proportional to afterload|
Ans. C Within physiological limits, the force of contraction is proportional to initial length of cardiac muscle fiber
Frank Starling’s lawof heart states that the force of the contraction of myocardium is proportional to the initial length of the cardiac muscle fibers. Therefore an increase in diastolic filling will increase the force of contraction of myocardium.