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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.
Relate heart rate to cardiac output; Describe the effect of exercise on heart rate; Identify cardiovascular centers and cardiac reflexes that regulate heart function; Describe factors affecting heart rate; Distinguish between positive and negative factors that affect heart contractility; Summarize factors affecting stroke volume and cardiac output Describe the cardiac response to variations in blood flow and pressure The autorhythmicity inherent in cardiac cells keeps the heart beating at a regular pace; however, the heart is regulated by and responds to outside influences as well.