During diastole, the aerial pressure is maintained by

Due to the presence of elastic fibers in the Windkessel vessels, there is an elastic recoil during the diastole (they are stretched during systole), which results in a forward flow and an aoic pressure wave called as diastolic pressure. Entry of blood in the aeries causes the walls of these aeries stretched., and pressure increases to 120mmHg. At the end of the systole when the left ventricle stops ejecting blood and aoic valve closes ,the elastic valves of the aery maintains a high pressure even during diastole. A so- called insisura occurs in aoic pressure curve when the aoic valve closes--caused by sho period of backward flow of blood,immediately before the closure of valve,followed by sudden cessation of backflow.