Smooth muscles are:
Correct answer: A. Involuntary, fusiform and nonstriated
- A. Involuntary, fusiform and nonstriated
- B. Voluntary, multinucleate and cylindrical
- C. Involuntary, cylindrical and striated
- D. Voluntary, spindle-shaped and uninucleate
Explanation
Smooth muscle fibres are elongated and spindle shaped (fusiform). Each fibre contains a single oval nucleus surrounded by cytoplasm (sarcoplasm). In the cytoplasm, myofibrils are arranged longitudinally. These fibres lack striations and sarcolemma, however they are enclosed by a plasma membrane.
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