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9 Cards in this Set
- Front
- Back
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What affect does sympathetic stimulation have on the pupil of the eye?
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It dilates it to allow more light in during stressful situations.
It also thickens the lens to accomodate for near vision |
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What effect does sympathetic stimulation have on the GI tract?
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It constricts the sphincters, decreases gastric secretion and gastric motility.
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The parasympathetic nervous system relaxes the sphincters of the GI tract. What is the one exception to this?
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The Gastro-esophageal sphincter which is constricted to prevent the contents of the stomach back into the esophagus. This junction is a one way valve.
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What are the 4 Neuroglia cell types?
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Astrocytes
Oligodendrocytes Microglia (Clean Up Crew) Ependymal (Make CSF) |
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What is the function of Schwann Cells?
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They make myelin for the PNS
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What neurotransmitter is released by both sympathetic and parasympathetic pre-ganglionic neurons?
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Acetylcholine --> Activates cholinergic receptors
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What neurotransmitter is released by post-ganglionic neurons?
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Norepinephrine
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What is the difference between pre-ganglionic neurons of the sympathetic vs parasympathetic nervous system?
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Sympathetic - short
Parasympathetic - long The sympathetic nervous system has cholinergic pre-ganglionic neurons and noradrenergic post-ganglionic neurons The parasympathetic has cholinergic pre and post ganglionic neurons. |
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Describe the pathway of catecholamine release.
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Sympathetic nervous system fires down a pre-ganglionic pathway to the adrenal medulla of the kidney and releases acetylcholine which stimulates the adrenal medulla to release catecholamines (80/20, epi/norepi) when then circulate and bind adrenergic receptors to produce sympathomimetic effects.
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