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Question

In a reflex arc, the _______ neuron receives signals from _______ organs and transmits it via _____ nerve root.
  1. afferent, sensory, dorsal
  2. efferent, sensory, ventral
  3. afferent effector, dorsal
  4. efferent, effector, ventral


Solution

The correct option is A afferent, sensory, dorsal
Reflex arc is the pathway taken by nerve impulse generated at the receptor by a stimulus to reach the effector organ during a reflex action.  
The afferent neuron receives signal from a sensory organ and transmits the impulse via a dorsal nerve root into the CNS (at the level of spinal cord). The efferent nueuron then carries signals from CNS to the effector. The stimulus and response thus forms a reflex arc. 

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