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B
Upper arm, are smooth muscle fibres, fusiform in shape.
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C
Heart, are involuntary and unstriated.
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D
Intestine, are striated and involuntary.
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Solution
The correct option is A Thigh, are striated and voluntary.
The muscles in the upper arm and shoulder are striated muscles and not smooth muscles. Also, these are triangular in shape. So, option B is incorrect. Heart possesses unique muscles, called cardiac muscles, which are involuntary striated muscles. So, option C is incorrect. The intestinal muscles are involuntary and are smooth muscles. So, option D is incorrect.
The muscles present in the thigh are striated and voluntary.