Waec Model Questions Vol1 2022 Biology Question 39
Practice objective / multiple choice question 39 from the 2022 Waec Model Questions Vol1 Biology examination.
A small artery 10 cm long has a radius of 0.5 mm and blood viscosity of 3.5×10⁻³ Pa·s. Blood flow rate follows Poiseuille's law: \(Q = \frac{\pi\,\Delta P\,r^{4}}{8\,\eta\,L}\). If the pressure difference \(\Delta P\) is 100 mmHg, what percentage decrease in flow rate occurs when vasoconstriction reduces the radius by 20% (all other variables remain unchanged)?
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This is Waec Model Questions Vol1 2022 Biology Question 39. It is one of the objective questions from the 2022 Waec Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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