Class 10th science part 2 give scientific reason we feel exhausted after exercising

(4) We feel exhausted after exercising.

Ans. When we undertake constant exercises, there may be shortage of oxygen for the cells. Therefore, our muscles and other tissues perform anaerobic respiration in such condition. In this process, lactic acid is formed. Molecules of ATP produced in oxidation of food are also much less. Thus, there is less energy in the body and accumulation of lactic acid too. All this brings about a feeling of exhaustion.