O-LevelBiologyRespiration5090/11 · Oct/Nov 2013 · Q161 Mark
Seals are marine mammals. When they dive under water, they are capable of respiring anaerobically for long periods. During this time, blood flow to the muscles is greatly reduced, but the muscles are able to tolerate high concentrations of lactic acid. The graph shows the concentrations of lactic acid and oxygen in the blood of a seal before, during and after a dive. What explains the change in lactic acid concentration during time X?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Aincreased lactic acid production
Bincreased blood flow to the muscles
Cincreased rate of aerobic respiration
Dreduced rate of anaerobic respiration
✓ Correct answer
B: increased blood flow to the muscles
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