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Published byHugh Miles Modified over 8 years ago
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The Autonomic Nervous System and Higher-Order Functions Chapter 16
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Somatic Vs Autonomic
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Sympathetic Vs Parasympathetic SympatheticParasympathetic Thoracolumbar Short preganglionic fibers Long postganglionic fibers Fight or Flight Cranial-sacral Long preganglionic Short postganglionic Rest and Digest Enteric Nervous System: visceral reflexes, walls of digestive organs
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Sympathetic Vs Parasympathetic
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Sympathetic Ganglia located in three locations o Sympathetic Chain Ganglia o Collateral Ganglia o Adrenal Medulla
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Sympathetic Activation Long Lasting and work systemically Alters peripheral and central nervous system Utilizes epinephrine and norepinephrine Receptors: o Alpha 1 -Excitatory through the release of Ca 2+, Closes digestive, urinary and blood vessel sphincters o Alpha 2 -Inhibitory through lowering of cAMP levels, Activates or inactivates enzymes, Inhibits parasympathetic effects o Beta 1 -Increases heart rate and force of contraction and metabolic activity of skeletal muscles o Beta 2 -Decreases respiration rate and causes dilation of respiratory tract o Beta 3 –increases lipolysis of adipose tissue
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Parasympathetic Preganglionic neurons associated with Cranial nerves o Oculomotor (eye movement) o Facial (taste and facial expression) o Glossopharyngeal (taste, blood pressure and blood content) o Vagus (visceral organs) Postganglionic neurons short and lie close to target organ
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Parasympathetic Activation Short lived and localized Receptors o Nicotinic –excitatory, release Ach, increases postsynaptic memebrane permeability to Na+ o Muscarinic –excitatory or inhibitory, G Protein Coupled Receptors
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ANS Interaction Autonomic Tone Cooperation through antagonism Table 16.3 Visceral reflexes Higher Levels of Control
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Memory Fact based memory Skill based memory Short term memory Long term memory Memory consolidation Cellular mechanisms
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Sleep Non-REM sleep (deep sleep) REM sleep –most dreaming occurs
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