BIOLOGY 225 Lecture Notes - Lecture 14: Postganglionic Nerve Fibers, Autonomic Nervous System, Peripheral Nervous System

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18 Oct 2016
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Peripheral nervous system divisions: afferent (sensory) branch, efferent branch! Autonomic division: sympathetic, parasympathetic, enteric regulates organs such as stomach and gut! Autonomic nervous system involuntary nervous system : involved in homeostasis, branches of autonomic nervous system! Sympathetic: most active during stress or physical activity, ght-or- ight system! Parasympathetic : most active during periods of rest, rest and digest system! Enteric: independent of other two systems! Maintaining homeostasis: utilizes both the sympathetic and parasympathetic systems, three features of the two systems:! Monday, october 10, 2016: most organs receive input from both systems! Antagonistic action: one system stimulates while the other inhibits! Basal tone: even under resting conditions autonomic neurons carry action potentials! Dual innervation: almost all organs are managed by sympathetic and parasympathetic nerves , sympathetic nerves are all spinal nerves, parasympathetic nerves are either spinal or cranial nerves! Antagonistic action : example: sympathetic system increases heart rate and parasympathetic system decreases heart rate activity!

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