1.

We feel exhausted afterexercising.

Answer»

Solution :(1) When we undertake constant exercises, there MAY be SHORTAGE of OXYGEN for the cells. (2) Therefore, our muscles andother tissues perform anaerobicrespiration in such condition. (3) In this process, lacticacid is formed. Molecules of ATP produced in oxidation of food are also much less. (4) Thus, there isless energy in the BODY and accumulation oflactic acid too. All this brings about a feeling of EXHAUSTION.


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