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Questions and Answers
Which region of the spinal cord gives rise to sympathetic nerve fibers?
Which region of the spinal cord gives rise to sympathetic nerve fibers?
What is the primary function of the sympathetic nervous system?
What is the primary function of the sympathetic nervous system?
In which anatomical location do sympathetic nerve fibers primarily originate?
In which anatomical location do sympathetic nerve fibers primarily originate?
What is a key characteristic of the parasympathetic nervous system compared to the sympathetic nervous system?
What is a key characteristic of the parasympathetic nervous system compared to the sympathetic nervous system?
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Which statement best describes the relationship between the sympathetic and parasympathetic nervous systems?
Which statement best describes the relationship between the sympathetic and parasympathetic nervous systems?
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What can be said about the length of preganglionic fibers in the sympathetic nervous system?
What can be said about the length of preganglionic fibers in the sympathetic nervous system?
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What type of neurotransmitter is secreted by preganglionic sympathetic fibers?
What type of neurotransmitter is secreted by preganglionic sympathetic fibers?
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Which of the following is true regarding postganglionic fibers in the sympathetic nervous system?
Which of the following is true regarding postganglionic fibers in the sympathetic nervous system?
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What distinguishes preganglionic fibers in the sympathetic nervous system from their postganglionic counterparts?
What distinguishes preganglionic fibers in the sympathetic nervous system from their postganglionic counterparts?
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In the context of sympathetic nervous system fibers, which statement is accurate?
In the context of sympathetic nervous system fibers, which statement is accurate?
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Study Notes
Sympathetic Nervous System
- Originates in the spinal cord between T1-L2/L3 (thoracolumbar region)
- Preganglionic fibers are shorter than postganglionic fibers
- Always cholinergic, meaning it secretes acetylcholine (Ach)
- Has a generalized action
- Catabolic action (breaks down body stores)
- Delays evacuation of visceral content
Parasympathetic Nervous System
- Originates from the brainstem (midbrain, pons, and medulla) or the sacral spinal cord (craniosacral)
- Pre ganglionic fibers activate nicotinic receptors in the post ganglionic fibers
- Postganglionic fibers are always cholinergic, meaning they secrete Ach
- Post ganglionic fibers activate nicotinic or muscarinic receptors
- Localized action
- Anabolic action (conserves body stores)
- Increases gastrointestinal secretion and motility (secretomotor)
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Description
Explore the key differences between the sympathetic and parasympathetic nervous systems in this quiz. Understand their origins, actions, neurotransmitters, and overall effects on the body. Perfect for students studying basic human physiology.
