Endurance athletes may suffer from muscle fatigue when contraction of the muscle fibres is disrupted. It is thought that the disruption of the contraction of muscles is caused by a lack of calcium ions within the muscle fibre. In an investigation, a group of cyclists completed a 30 km time trial in a simulator. The blood lactate concentration was measured at rest, during exercise and after exercise. The results are shown on the graph. Explain the effect on the lactate concentration from 15 minutes to 60 minutes on the graph. (2) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................

Biology
IGCSE&ALevel
EDEXCEL
Exam No:WBI1501-que-20241024 Year:2024 Question No:3(c)(i)

Answer:

An explanation that includes two of the following points:
- (small) increase in lactate concentration (between 15 to 60 minutes / during exercise) / little change in lactate concentration (between 15 to 60 minutes) (1)
- because \{lactate / lactic acid\} is produced by anaerobic respiration (1)
- lactate produced is being converted into pyruvate (1)

Knowledge points:

CH7 – Respiration, Muscles and the Internal Environment

Solution:

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