The sensation of fatigue in the muscles after prolonged strenuous physical work is caused by
- Aa decrease in the supply of oxygen
- Bminor wear and tear of muscle fibres
- Cthe depletion of glucose
- Dthe accumulation of lactic acidCorrect
Explanation
The correct option is D because during prolonged strenuous physical work, the body requires energy faster than oxygen can be supplied to the muscles. This leads to anaerobic respiration, a process where glucose is broken down without sufficient oxygen. A byproduct of this process is the accumulation of lactic acid in the muscle tissues. This buildup increases acidity in the muscles, which interferes with their ability to contract and results in the physical sensation of fatigue and soreness. While factors like glucose depletion and oxygen decrease are involved in the overall process of exhaustion, the specific sensation of muscle fatigue during or immediately after intense exercise is primarily attributed to lactic acid accumulation.
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