Which of the following statements about ...

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 pyruvic acid accumulation.

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Which of the 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 a sensory neurone III. during muscle contraction, isotropic band gets elongated. IV. repeated activation of the muscles can lead to lactic acid accumulation.

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