Igcse Model Questions Vol1 2018 Biology Question 31

Practice objective / multiple choice question 31 from the 2018 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2018 Biology Objective / Multiple Choice Medium Difficulty
Question 31 IGCSE_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • objective

During moderate exercise a person's oxygen consumption ( \(\dot{V}O_2\) ) rises to 1.2 L min\(^{-1}\). The arterial‑venous oxygen difference at this intensity is 0.15 L O\(_2\) per litre of blood. The heart rate is 120 beats min\(^{-1}\) and the stroke volume is 80 mL beat\(^{-1}\).\n\n(a) Calculate the minimum cardiac output required to supply the observed oxygen demand.\n\n(b) Calculate the actual cardiac output from the given heart rate and stroke volume and state whether it meets the minimum requirement.

Answer Options

A. Minimum CO = 8.0 L min⁻¹; Actual CO = 8.0 L min⁻¹ - therefore the actual output is sufficient.
B. Minimum CO = 7.5 L min⁻¹; Actual CO = 9.6 L min⁻¹ - therefore the actual output is sufficient.
Correct Answer C. Minimum CO = 8.0 L min⁻¹; Actual CO = 9.6 L min⁻¹ - therefore the actual output is sufficient.
D. Minimum CO = 8.0 L min⁻¹; Actual CO = 9.6 L min⁻¹ - therefore the actual output is insufficient.
Correct Answer
C
Correct Option:
Minimum CO = 8.0 L min⁻¹; Actual CO = 9.6 L min⁻¹ - therefore the actual output is sufficient.

About This Question

This is Igcse Model Questions Vol1 2018 Biology Question 31. It is one of the objective questions from the 2018 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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