Characteristics of smooth muscle fibres are

cylindrical, unbranched, striated, multinucleate and voluntary

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spindle-shaped, unbranched, unstriped, multinucleate and involuntary

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spindle-shaped, unbranched, unstriated, uninucleate and involuntary

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cylindrical, branched, unstriped, multinucleate and involuntary

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Solution

The correct option is C
spindle-shaped, unbranched, unstriated, uninucleate and involuntary

The smooth muscle consists of long, narrow unbranched spindle-shaped fibres. Each fibre contains a single oval nucleus in its thick middle part. The cross-striations are absent so that the fibres look smooth, hence the name unstriated. Its contraction is not under the will, therefore, it is also called involuntary muscle.

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Similar questions

Name the following :

(a) Multinucleate muscle fibre ;

(b) Spindle shape muscle fibre.

\begin{matrix} Skeletal muscle & Smooth muscle Movement type & i.____ & Involuntary Structure & Cylindrical and multinucleated & ii.____ \end{matrix}

\begin{matrix} Column I & Column II (a) Striated muscles & (i) cells are branched and uninucleate (b) Unstriated muscles & (ii) cells are unbranched and multinucleate (c) Cardiac muscles & (iii) cells are spindle-shaped and uninucleate \end{matrix}

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