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What is According to Poiseuille's law, reducing the radius of an airway to one-third will increase its resistance how many fold? and explain in detail?
Poiseuille's law states that during laminar flow, airway resistance is inversely propoional to the 4th power of the radius, other things being equal. Therefore, a reduction in the radius by a factor of 3 increases the resistance by 34, that is, 81.