Gce Model Questions Vol1 2021 Biology Question 23
Practice objective / multiple choice question 23 from the 2021 Gce Model Questions Vol1 Biology examination.
Using the Fick principle, the rate of oxygen consumption (\( \dot V_{O_2}\)) is given by \( \dot V_{O_2}= Q \times (C_{aO_2}-C_{vO_2})\). A person has a cardiac output of \(5\ \text{L min}^{-1}\). Their arterial blood oxygen content is calculated from haemoglobin concentration \(15\ \text{g dL}^{-1}\), arterial oxygen saturation \(97\%\) and arterial \(P_{O_2}=100\ \text{mmHg}\). Venous oxygen content is \(0.12\ \text{ml O}_2\text{ ml}^{-1}\). (Use \(C_{aO_2}= (Hb \times 1.34 \times S_{aO_2}) + 0.0031\,P_{aO_2}\) with \(Hb\) in g dL\(^{-1}\) and \(P_{aO_2}\) in mmHg.) Calculate the whole‑body oxygen consumption in \(\text{ml min}^{-1}\), rounded to the nearest whole number.
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This is Gce Model Questions Vol1 2021 Biology Question 23. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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