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Muscle contraction - class-XI

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Multiple Choice

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

  1. i and iv
  2. i and iii
  3. ii and iii
  4. i, ii and iii
  5. i and ii
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