Question

During heavy physical work, the demand for energy is high and the
supply of oxygen is limited. We may experience muscle cramps.
(1) What type of respiration takes place in our muscles in such a
situation?
(ii) Which acid is formed in our muscles?
(iii) What can we do to get relief from cramps? Write any one point.​

Answer 1

During heavy exercise, the demand for energy is high but the supply of oxygen to produce energy is limited. Therefore, anaerobic respiration takes places in the muscles cells to fulfil the demand for energy. This anaerobic breakdown of glucose leads to the formation of lactic acid in muscles. The accumulation of lactic acid in muscles leads to muscle cramps.
HenceDuring heavy exercise, we get cramps in the legs due to the accumulation of Lactic acid.
So, the correct answer is 'Lactic acid'.