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Although systemic vascular resistance can be calculated from mean arterial pressure and cardiac output, its value is not determined by either of these variables (although its value changes depending upon the pressure - see below). Systemic vascular resistance is determined by vascular diameters, length, anatomical arrangement of vessels, and blood viscosity. Because vessels are compliant, increasing intravascular pressure expands the vessels, thereby causing a small reduction in resistance. Nonetheless, the decrease in systemic vascular resistance that occurs when pressure

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Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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