FIGURE 18 Pressures recorded from three sites in the aorta. At all three sites pressure fluctuates between a maximum systolic pressure and a minimum diastolic pressure. The difference between systolic and diastolic pressure is the pulse pressure. The amplitude and shape of the pressure signal is altered as distance from the heart increases. Note that pulse pressure in the abdominal aorta (bottom panel) is higher than that in the aortic root. Mean pressure (100 mm Hg) are the same at all levels. The vertical time lines reveal that the systolic rise in pressure occurs much later in the abdominal aorta than in the root.

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