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The reduction in the rate of systolic ejection following elevation of aortic pressure leads to changes in cardiac output opposite to alteration in peripheral resistance, thus tending to maintain a relatively constant arterial pressure.
This mild boost  does not have significant effect on the activity of the heart and  there is little or no raised heart rate. The peripheral blood  vessels contract and the combination of increased cardiac output,  vasoconstriction and changes in the pulses rate have a peculiar  effect on blood pressure.