According to Poiseuille’s law, reducing the radius of an airway to one-third will increase its resistance how many fold?

Correct Answer: 81
Description: 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.
Category: Physiology
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