Question

Statements about the mechanism of muscle contraction:
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 neuron
III. During muscle contraction, isotropic band gets elongated
IV. Repeated activation of the muscles can lead to lactic acid accumulation

• A. $I$ and $IV$ alone are correct
• B. $I$ and $III$ alone are correct
• C. $II$ and $III$ alone are correct
• D. $I, II$ and $III$ alone are correct
• E. $I$ and $II$ alone arc correct

Answer 1

Answer: (A)

Muscle contraction is initiated by a signal sent by CNS via a motor neuron. During muscle contraction, isotropic band gets shorten.