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[A] : In vertebrates, motor fibres to s...

[A] : In vertebrates, motor fibres to striped muscle. parasympathetic fibres to smooth muscle. and preganglionic sympathetic ii- bres are cholinergic.
[R]: Cholinergic designates the type of nerve fibre that releases acetylcholine from its ending when stimulated by a nerve impulse.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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Arrange the cardiac muscle fibres, skeletal muscle fibres and the nerve fibres on the basis of velocity of impulse conduction in descending order, i.e. from maximum to the minimum.

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Which of the following statements is/are correct? (i) During muscle contraction, isotropic band gets elongated. (ii). Acetylcholine is released when the neural signal reaches the motor end plate. (iii) Muscle contraction is initiated by the signal sent by CNS via a sensory neuron. (iv) Repeated activation of muscle can lead to lactic acid accumulation.

Which of the following statements about the mechanism of muscle contraction are correct ? (i) Acetylcholine is released when the neural signal reaches the motor end plate. (ii) Muscle contraction is initiated by a signal sent by CNS via sensory neuron. (iii) During muscle contraction, isotropic band gets elongated (iv) Repeated activation of the muscles can lead to lactic acid accumulation.

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