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  4. Usain Bolt, an olympic runner, at the end of a 100 metre sprint, will have more of which of the following in his muscles?

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Q. Usain Bolt, an olympic runner, at the end of a $100$ metre sprint, will have more of which of the following in his muscles?

KVPYKVPY 2012

Solution:

During vigorous muscular activity like running, muscles perform anaerobic respiration after a while due to scarcity of oxygen. During anaerobic respiration in muscles, lactic acid is produced as a byproduct. Thus a runner will have lactic acid in his muscles after a $100$ metre sprint.