Q9.Assertion: Smooth muscle fibres do not appear to be striated.
Reason: This is due to regular alternate arrangement of thick and thin filaments in smooth
muscle fibre.
(a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
(c) Assertion is correct and Reason is incorrect.
(d) Assertion is incorrect and Reason is correct. [1]
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Answer:
opt: a)both A and R are true and R is correct explanation of A
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Answer- (c) Assertion is correct and reason is incorrect.
Smooth muscle fibres are long, spindle shaped and non striaed or unbranched.
In these muscle fibres A and I band are totally absent because actin and myosin rods are irregularly distributed known as unstraited.
Smallest smooth muscle present in ciliary body of eye and blood vessel.
Smooth musclre fibres are involuntary in nature.
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