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What is the mean arterial pressure? The mean arterial pressure (MAP) is defined as an approximation of a time-weighted average of blood pressure values in large system arteries during the cardiac cycle. It is directly related to the cardiac output. To calculate the MAP, you need two values - you systolic and diastolic blood pressure.
2) Blood pressure, exchange, and components of blood.  Blood pressure is determined partly by cardiac output and partly by peripheral resistance.  Contraction of smooth muscles in walls of arterioles constricts these vessels, increasing peripheral resistance, and increasing blood pressure upstream in the arteries.