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