UGA CBIO 2200 - CBIO 2200 Final Lectures (12 pages)

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CBIO 2200 Final Lectures



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CBIO 2200 Final Lectures

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Pages:
12
School:
University of Georgia
Course:
Cbio 2200 - Anat & Physiol I
Anat & Physiol I Documents

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11 20 14 2 02 PM Chapter 15 The Autonomic Nervous System Autonomic Nervous System Visceral Motor Division Motor commands sent to viscera internal organs Divided into sympathetic and parasympathetic divisions Regulation of breathing blood pressure heart rate etc o Things outside of conscious control Receptors control these functions o Thermoreceptors Body heat o Baroreceptors Pressure Ex Elderly people become dizzy when they stand up quickly because their baroreceptors don t work as quickly Visceral Reflexes ANS is responsible for body s visceral reflexes Visceral reflex arc Receptors Afferent Neurons Interneurons Efferent Neurons Effectors Baroreflex High blood pressure detected by arterial stretch receptors baroreceptors o Example of homeostatic negative feedback loop Advantageous because body senses pressure of blood as soon as it comes off of aorta away from heart If blood pressure it too high could damage other organs Kidney normally first to be damaged liver normally last to be damaged Information sent to brain when blood pressure gets too high two ways to decrease BP once message gets to brain Blood vessels may dilate Decrease heart rate Autonomic Motor Pathways vs Somatic Motor Pathways Somatic Myelinated fiber from somatic efferent nerve to gland Autonomic Two neurons from CNS to effectors o Preganglionic fiber and postganglionic fiber Myelinated preganglionic fiber synapses on ganglion Fiber that leaves ganglion is an unmyelinated postganglionic fiber that will synapse on the target Functional Organization of Somatic vs Autonomic Conscious somatic vs unconscious autonomic control Divisions of the ANS Sympathetic Division Prepares body for physical activity o Fight or flight Prepares you for stressful situations o Heart rate breathing etc all increase o Digestion decreases Parasympathetic Division Calms body functions o Rest and digest o Heart rate breathing etc normal o Body can focus on digestion Sympathetic Division Thoracolumbar Division Short



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