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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.
Blood pressure varies with changes in blood volume, TPR, and cardiac output, which are determined primarily by venous return and neural and hormonal controls. Short-term mechanisms include both (1) neural and (2) hormonal controls, which alter blood pressure by changing peripheral resistance and CO.