Question

Which of the following statements is correct about reflex arc?

(i). Reflex arcs are efficient quick responses.
(ii). Reflex arcs are evolved for functioning in the absence of true thought processes.
(iii). A reflex arc is a neural pathway that controls reflex action.

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

Answer 1

The correct option is A (i), (ii) and (iii)

• Reflex arcs have evolved in animals because the thinking process of the brain is not fast enough.
• Many animals do not have complex neuron networks which is needed for thinking and it is considered efficient. It is a neural pathway that controls a reflex action, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord.
• This characteristic allows reflex actions to occur relatively quickly by activating spinal motor neurons without the delay of routing signals through the brain, although the brain will receive sensory input while the reflex is carried out.
• Analysis of the signal takes place after the action has been taken.

Therefore, the correct answer is option A.