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Read the following statements is context...

Read the following statements is context to muscle tissue and choose the correct answer .
(i) Excessive exercise results in anaerobic Respiration and forms lactic acid .
(ii) As per sliding filament theory of muscle contraction, the filament that moves to shorten a muscule is actin .
(iii) The muscles primarily involved in locomotion is striated muscles .

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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.