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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.
Arterial baroreceptors respond very quickly to changes in blood pressure, firing more rapidly as blood pressure increases, resulting in a lowered heart rate and lowered blood vessel resistance. When they stop firing, the central nervous system responds by increasing heart rate and blood vessel resistance.