Sympathetic vs. Parasympathetic Nerves
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Objective
I can differentiate between the structures and functions of the sympathetic and parasympathetic nervous systems.
Part 1 of 3
Key concepts
3 concepts
- 1
The sympathetic nervous system, also known as the "fight or flight" system, prepares the body for stress, while the parasympathetic nervous system, or "rest and digest" system, conserves energy and promotes relaxation.
- 2
In the sympathetic nervous system, preganglionic neurons originate in the thoracic and lumbar regions of the spinal cord, whereas in the parasympathetic nervous system, preganglionic neurons originate in the brainstem and sacral spinal cord.
- 3
The neurotransmitter acetylcholine is used at preganglionic synapses in both the sympathetic and parasympathetic nervous systems; however, the sympathetic nervous system uses norepinephrine at its postganglionic synapses, while the parasympathetic nervous system uses acetylcholine at both pre- and postganglionic synapses.
Part 2 of 3
Practice
7 questions
What are the two main branches of the autonomic nervous system?
Describe the general function of the sympathetic nervous system and provide an example of its effect on a specific organ.
Part 3 of 3
Exit ticket
Quick comprehension check
“Describe one structural difference and one functional difference between the sympathetic and parasympathetic nervous systems.”
Sample answer included in the free materials
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