Which point on the diagram marks the beginning of ventricular systole?
Correct Answer: A
Description: Ans. A. APressure - volume loop of the left ventricle. During diastole, the ventricle fills and pressure increases from d to a. Pressure then rises sharply from a to b during isovolumetric contraction and from b to c during ventricular ejection. At c, the aortic valves close and pressure falls during isovolumetric relaxation from c back to d.Isovolumetric contraction starts at A therefore it is the beginning of ventricular systole.
Category:
Physiology
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