Assertion: Thigh muscles can get tired but not heart muscles. Reason: Muscles of thigh are voluntary while muscles of heart are involuntary muscles. O (a) Both A and Rare true, and R is correct explanation of the assertion. (b) Both A and Rare true, but Ris O not the correct explanation of the assertion. O (c) A is true, but Ris false. O (d) A is false, but Ris true.
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Fatigue can have causes that aren't due to underlying disease. Examples include lack of sleep, heavy exertion, jet lag, a large meal or ageing.
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