After participating in a marathon race the calf muscles of runners start aching.
What is the reason for this?

Dear student,      
Please find below the solution to the asked query                                                              

Muscle ache after a marathon race is due to deposition of lactic acid. In case of great physical activity, the muscle cells respire anaerobically and produce lactic acid which gets deposited in the muscles. So, the process responsible for the muscle pain is anaerobic respiration.

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because of sweat
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 yup because of sweat
 
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