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B
Smooth muscle
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C
Intercalated disc
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D
All of these
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Solution
The correct option is A Smooth muscle
Smooth muscle is composed of grouped, fusiform cells with weak, involuntary contractions. Smooth muscle fibers are long, spindle-shaped (fusiform) cells. They have single and centrally placed nucleus in each cell of smooth muscle. The absence of striation is also characteristic of the smooth muscle cells.