When a nociceptor is stimulated what occurs? a. Action potential in efferent neuron - release of Acetylcholine - descending track in spinal cord – alertness in reticular formation b. Action potential in afferent neuron - release of Substance P- ascending track in spinal cord – alertness in reticular formation c. Action potential in afferent neuron – release of epinephrine - ascending track in spinal cord – alertness in reticular formation d. Action potential in afferent neuron – release of norepinephrine - ascending track in spinal cord – alertness in reticular formation e. Action potential in efferent neuron - release of Substance P- descending track in spinal cord – alertness in reticular formation