________ is the pathway of impulses to and from the spinal cord.
response to external stimuli
instantaneous response without thought
Reflex arc is the pathway of impulses to and from the spinal cord which helps in generating appropriate reflex actions. So it includes:
1. The receptor organ which receives the stimulus.
2. A sensory neuron which carries the impulse from the sensory organ to spinal cord.
3. A relay neuron/intermediate neuron which transmits the signal further.
4. A motor neuron which carries the impulse from spinal cord to the effector organ.
5. The effector organ.