A-LevelBiologyGas exchange9700/12 · Oct/Nov 2012 · 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

✓ Correct answer

C: 325

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2012 Paper 1 Variant 2, question 34.

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