The physiological significance of the elastic reservoir function of the aorta is that it can buffer the fluctuation of blood pressure, prevent the systolic pressure from being too high and the diastolic pressure from being too low, and make the pulse pressure difference decrease. Because the elastic reservoir function of the aorta can change gradually with age, in childhood, due to more elastic fibers in the vessel wall and less collagen fibers, the elastic reservoir function is strong, under the same volume change, the change in blood pressure is small, and the pulse pressure difference is small, but in old age, due to the degeneration of elastic fibers in the arterial wall, its dilatability decreases, so it leads to the weakening of the elastic reservoir function, thus making The pulse pressure difference increases in the elderly. Generally speaking, the earlier the process of atherosclerosis, the more the role of the elastic reservoir is reduced, and the more it causes an increase in the magnitude of blood pressure changes.