A-LevelBiologyGas exchangeOct/Nov 2012Paper 1 Q341 Mark
An adult human has approximately 5 dm³ of blood, which circulates about once a minute. 100 cm³ of arterial blood carries 19 cm³ of oxygen. 100 cm³ of venous blood carries 12.5 cm³ of oxygen. What is the approximate volume in cm³ of oxygen taken up per minute in the lungs?
A32.5
B65
C325
D950
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The correct answer is C. This question tests the candidate's understanding of gas exchange within the Biologysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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