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â¢ As you go through this topic, keep in mind this flow chart, which outlines the factors affecting blood pressure: Factors Affecting Blood Pressure Peripheral Resistance Vessel Elasticity Blood Volume Cardiac Output Page 2. Goals â¢ To understand the factors that affect peripheral resistance, and therefore blood pressure. â¢ To understand how vessel elasticity, blood volume, and cardiac output affect blood pressure. Page 3. Sources of Peripheral Resistance â¢ One of the main factors that affects blood pressure is peripheral resistance.
Periods of anxiety trigger the release of hormones that cause increased heart rate and decreased blood vessel diameter, both of which lead to increased blood pressure. The effect of stress on short term blood pressure can be dramatic, leading to mean arterial pressure increases of 30%-40%. These changes are short lived, though, with heart rate, blood vessel diameter, and blood pressure returning to normal as the hormones are eliminated. People with chronic anxiety disorders do not have chronic blood pressure increases as a result of their anxiety.