A) Muscle contraction
B) Muscle relaxation
C) Muscle recovery
D) All the above
Correct Answer: C
Solution :
During active work, the rate of oxygen supply by the lungs falls short of requirement of the muscles. Hence, lactic acid accumulates in the muscles and the breathing gradually becomes hard to enhance \[{{O}_{2}}\] intake by the lungs. This is called oxygen deft.
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