both a and r tired and r not relative of a
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The thigh muscles are the striated muscles which soon get fatigued due to overwork. These muscles show fast contractions and then tire immediately due to accumulation of lactic acid. The muscles of heart wall are the cardiac muscles do not fatigued easily and show rhythmic and automatic contractions. They have specialized regions of the cell membranes which function as boosters for muscle contraction waves. Thigh muscles are called voluntary muscles because they can be moved at the will of organism whereas heart muscles can't be moved at one's will and therefore are involuntary. So, the correct answer is B' If both the assertion and the reason are true but the reason is not correct explanation of the assertion'
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