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a
Fusiform, unstriated and involuntary
b
Cylindrical, unstriated and involuntary
c
Fusiform, striated and involuntary
d
Fusiform, unstriated and voluntary
answer is A.
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Detailed Solution
Smooth muscle fibres are spindle-shaped (fusiform). They do not show striations (unstriated). Their contraction cannot be consciously controlled (involuntary). We usually are not able to make it contract merely by thinking about it as we can do with skeletal muscles.