Question

Which of the following correctly describes the order of events occurring during a sympathetic nervous system response?

Answer 1

Answer;

Stimulation of thoracic or lumbar spinal regions; impulse reaches chain ganglion; acetylcholine release

Explanation;

• The sympathetic nervous system is part of the autonomic nervous system, which also includes the parasympathetic nervous system.
• The sympathetic nervous system  functions by activating the fight or flight responses. It operates through a series of interconnected neurons.
• Sympathetic neurons of the spinal cord communicate with the PNS via a series of sympathetic ganglia. Spinal cord sympathetic neurons joins with the peripheral sympathetic neurons through the chemical synapses.
• At synapses, preganglionic sympathetic neurons release acetylcholine, which binds and activates nicotinic acetylcholine receptors on the postganglionic neurons.

Answer 2

Stimulation of thoracic or lumbar spinal regions; impulse reaches chain ganglion; acetylcholine release. Acetylcholine is released if the synapse happens in the sympathetic ganglion, if the synapse is in post-ganglionic neuron, norepinephrine is released.