Question

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 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)
• B. (i) and (iii)
• C. (ii) and (iii)
• D. (i), (ii) and (iii)

Answer 1

The correct option is A (i) and (iv)

Following are the correct statements about the mechanism of muscle contraction:

(i) Acetylcholine is released when the neural signal reaches the motor end plate.

(ii) Repeated activation of the muscles can lead to lactic acid accumulation.

So, the correct answer is (a).