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Characteristics of smooth muscle fibres are

1. spindle-shaped, unbranched, unstriated, uninucleate and involuntary
2. spindle shaped, unbranched, unstriped, multinucleate and involuntary
3. cylindrical, unbranched, unstriped, multinucleate and involuntary
4. cylindrical, unbranched, striated, multinucleate and voluntary

Correct answer: spindle-shaped, unbranched, unstriated, uninucleate and involuntary

Solution

Smooth muscle cells are characteristically spindle-shaped, have a single central nucleus, and do not show striations. They are also involuntary, meaning they contract without conscious control.

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