Smooth muscle fibres are:

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(B) Smooth muscle fibres are characterized by the following features:$1$. Shape: They are spindle-shaped (fusiform) with tapered ends.$2$. Striations:

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Spindle-shaped,unbranched,non-striated,uninucleate and involuntary

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(B) Smooth muscle fibres are characterized by the following features:$1$. Shape: They are spindle-shaped (fusiform) with tapered ends.$2$. Striations: They are non-striated,meaning they lack the alternating light and dark bands seen in skeletal or cardiac muscles.$3$. Nucleus: They are uninucleate,containing a single nucleus located in the center of the cell.$4$. Control: They are involuntary,meaning their contraction is not under conscious control.$5$. Branching: They are unbranched.Therefore,the correct description is spindle-shaped,unbranched,non-striated,uninucleate,and involuntary.

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