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Message: <blockquote data-quote="imhotep" data-source="post: 24516277" data-attributes="member: 562115">The answer to your question in a mathematical way, you can use the Poiseuille’s equation.vessel radius (r), vessel length (λ) and viscosity of blood (η)Blood Flow = π * ΔP * r^^4 * 8* η * λ   (Note π = pi)Also Blood Flow = ΔP/ResistanceThen we have..Resistance = 8ηλ/πr^^4Suppose that he flow rate of an artery is reduced to half of it;'s normal value due to deposits narrowing it.. You can easily calculate using the above equation...the new radius = 0.841 *old radius (a decrease of nearly 16%)Note - the decrease of 16% affects in a big way - flow rate is reduced to half!Because of the r^^4</blockquote>

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