Which of the following correctly describes the series of events occurring during a parasympathetic nervous system response?
a. stimulation of cranial regions; cranial root ganglion; acetylcholine release
b. stimulation of cranial regions; cranial root ganglion; norepinephrine release
c. stimulation of thoracic or lumbar spinal regions; chain ganglion; acetylcholine release
d. stimulation of thoracic or lumbar spinal regions; chain ganglion; norepinephrine rele

The correct answer is option c.

Explanation:

The sympathetic nervous system is the component of the autonomic nervous system that also comprises the parasympathetic nervous system. The prime function of the sympathetic nervous system is to stimulate the flight or fight response, and it functions via an array of inter associated neurons.  

The sympathetic neurons of the spinal cord interact with the peripheral nervous system through an array of sympathetic ganglia. The spinal cord sympathetic neurons combine with the peripheral sympathetic neurons via the chemical synapses. At synapses, the preganglionic sympathetic neurons discharge acetylcholine that combines and stimulates nicotinic acetylcholine receptors on the postganglionic neurons.  

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