Igcse Model Questions Vol1 2017 Biology Question 38

Practice objective / multiple choice question 38 from the 2017 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2017 Biology Objective / Multiple Choice Medium Difficulty
Question 38 IGCSE_MODEL_QUESTIONS_VOL1 • 2017 • BIOLOGY • objective

Blood flows through a cylindrical artery that is 30 cm long and has an internal radius of 2 mm. The viscosity of blood is \(3.5\times10^{-3}\) Pa·s and the pressure difference between the two ends of the artery is 1 200 Pa. (a) Using Poiseuille's law, calculate the volumetric flow rate in mL s⁻¹. (b) If a disease narrows the arterial radius by 20 %, determine the new flow rate and the percentage reduction in flow.

Answer Options

A. Original flow ≈ 9.0 mL s⁻¹; after 20 % radius reduction ≈ 2.9 mL s⁻¹; ≈68 % reduction
Correct Answer B. Original flow ≈ 7.2 mL s⁻¹; after 20 % radius reduction ≈ 2.9 mL s⁻¹; ≈59 % reduction
C. Original flow ≈ 7.2 mL s⁻¹; after 20 % radius reduction ≈ 4.5 mL s⁻¹; ≈38 % reduction
D. Original flow ≈ 5.8 mL s⁻¹; after 20 % radius reduction ≈ 2.3 mL s⁻¹; ≈60 % reduction
Correct Answer
B
Correct Option:
Original flow ≈ 7.2 mL s⁻¹; after 20 % radius reduction ≈ 2.9 mL s⁻¹; ≈59 % reduction

About This Question

This is Igcse Model Questions Vol1 2017 Biology Question 38. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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