A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: B
Solution :
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 which are unfatiguable and show rhythmic and automatic contractions. They have specialised regions of the cell membranes which function as boosters for muscle contraction waves. Thigh muscles are called voluntary muscles because they can moved at the will of organism whereas heart muscles can?t be moved at one?s will and therefore are involuntary.
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