O-LevelBiologyRespiration5090/12 · Oct/Nov 2022 · Q181 Mark

Fitness training in athletes reduces the need for anaerobic respiration. It also increases the rate at which lactic acid is removed after exercise. The table shows the concentration of lactic acid in the blood of four different athletes. They exercise for 20 minutes and rest for the next 70 minutes. From the fittest athlete to the least fit, which order is correct?

A3→2→1→4

B1→2→4→3

C2→3→4→1

D3→1→2→4

✓ Correct answer

A: 3→2→1→4

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2022 Paper 1 Variant 2, question 18.

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