BI13_Ch14 PP Outline - 1 2 The Autonomic Nervous System...

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1 The Autonomic Nervous System Chapter 14 2 Topics General Structure and Function Structure and Function of the Parasympathetic Nervous System Structure and Function of the Sympathetic Nervous System Referred Pain 3 The Autonomic Nervous System Targets involuntary functions Cardiac muscle Smooth muscle Glands Signals originate in the brain stem and hypothalamus 4 Sympathetic vs. Parasympathetic Send complimentary signals 5 Organization of the ANS E erent signals transmitted through 2 neuron chains Presynaptic neuron cell body in the CNS Postsynaptic neuron cell body in the PNS Ganglion 6 Practice Test Questions True or false? The ANS innervates skeletal muscle. True or false? The ANS motor neurons synapse directly with their e ector organs? How are the parasympathetic and sympathetic nervous system related to each other? 7 The Parasympathetic Nervous System Structure Function Neurotransmitter Drugs 8 Parasympathetic Neuron Chain Presynaptic neurons Long Emerge from CNS at brain stem and sacrum Found in cranial nerves never spinal nerves Postsynaptic neurons: Short Near e ector tissues 9 Oculomotor Nerve (III) Causes pupils to constrict and lenses to bulge Modifies vision to focus on near objects 10 Facial Nerve (VII)
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10 Facial Nerve (VII) Stimulates glands of the face to secrete Nasal, lacrimal, salivary 11 Glossopharyngeal Nerve (IX) Stimulates the large parotid salivary gland 12 Vagus nerve (X) 90% of parasympathetic nervous system Cardiac plexus Pulmonary plexus Celiac Plexus Stomach Liver Gallbladder Pancreas Small intestine Proximal half of the large intestine 13 Splanchnic Nerves Run deep to serve organs Carry sacral parasympathetic e erents Innervate Distal large intestine Urinary bladder Reproductive organs 14 The Parasympathetic Nervous System Structure Functions Neurotransmitter Drugs 15 Parasympathetic Functions Resting and digesting Waiting and mating 16 Decreases Heart Rate Slows contraction of pacemaker cells 17 Decreases Blood Pressure Vasodilation Blood vessel diameter increases Smooth muscle contraction More room for blood so pressure goes down 18 Decreases Airflow In The Lungs Bronchoconstriction Smooth muscle contraction decreases diameter
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Reduces oxygen levels when resting 19 Increases Function of GI Tract Promotes digestion Increases peristalsis
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