Question

Name the substance whose build up in the muscles during vigorous physical exercise may cause cramps.

Answer 1

Hey mate..

Here's your answer...

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Since during heavy exercise the demand for oxygen in
our body remains incomplete so we breathe under
anaerobic respiration.

Anaerobic respiration has an end product “lactic acid",
whose building in muscles can cause cramps.

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HOPE IT HELPS..

@Rêyaañ11

Answer 2

lactic acid builds up in the muscle.