Multiple choice

Rahul was absent in class because of muscle pain, which he claims to be due to excess physical exercise he had done yesterday. This pain is due to

  1. formation of lactic acid

  2. formation of acetic acid

  3. formation of pyruvic acid

  4. formation of Hydrochloric acid

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A Correct answer
Explanation

Sometimes, when there is a lack of oxygen in our muscle cells, another pathway for the break-down of pyruvate is taken. Here the pyruvate is converted into lactic acid, which is also a three-carbon molecule. This build-up of lactic acid in our muscles during sudden activity causes cramps.