Discussion
Heavy physical work can cause :
Answer: D
Heavy physical work causes localized muscular fatigue.
When muscles work hard, especially in heavy or static effort, their energy stores are depleted and metabolic products such as lactic acid build up, causing pain, loss of strength and tremor in the muscles involved. This is physiological, localized muscular fatigue.
Mental and psychological fatigue come from monotony, worry and mental effort rather than heavy muscular work, and transient fatigue is a short, passing tiredness rather than the specific result of heavy physical work.
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