Neco 2020 Biology Question 30

Practice objective / multiple choice question 30 from the 2020 Neco Biology examination.

Neco 2020 Biology Objective / Multiple Choice Medium Difficulty

Question 30 NECO • 2020 • BIOLOGY • objective

A small artery has an initial radius of 0.5 mm and a blood pressure gradient of 100 mmHg, giving a blood flow of 200 mL min⁻¹. During vasoconstriction the radius decreases to 0.4 mm and the pressure gradient falls to 80 mmHg. Assuming laminar flow and that flow \(Q\) is proportional to the pressure gradient times the fourth power of the radius (\(Q \propto \Delta P\,r^{4}\)), calculate the new blood flow rate (in mL min⁻¹).

Correct Answer A. 66 mL min⁻¹

B. 82 mL min⁻¹

C. 160 mL min⁻¹

D. 128 mL min⁻¹

Correct Answer

Correct Option:

66 mL min⁻¹

This is Neco 2020 Biology Question 30. It is one of the objective questions from the 2020 Neco Biology examination.

Difficulty level: Medium .

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