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Chapter 14 Autonomic Nervous system

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nayaveni's version from 2015-06-02 05:53

Section

Question Answer
What does the Autonomic Nervous system consist of?consists of motor neurons
What do the motor neurons of the ANS do?1. innervate smooth and cardiac muscle and glands 2. make adjustments to ensure optimal support for body activities 3. operate via subconscious control
What are other names for the autonomic nervous system (ANS)1. involuntary nervous system 2. general visceral motor system
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Question Answer
What are the two motor (efferent) divisions of the PNS?1. somatic nervous system 2. autonomic nervous system
How do the somatic and autonomic nervous system differ?they differ in 1. effectors 2. efferent pathwasy (and their neurotransmitters) 3. target organ responses to neurotransmitters
What are the effectors of the somatic nervous system?skeletal muscles
What are the effectors of the autonomic nervous system?1. cardiac muscle 2. smooth muscle 3. glands
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Question Answer
What is the efferent pathway of the somatic nervous system?a thick heavily myelinated somatic motor fiber makes up each pathway from the CNS to the muscle
What is the efferent pathway of the autonomic nervous system?(two-neuron chain) 1. preganglionic neuron (in CNS) has a thin, lightly myelinated preganglionic axon 2. ganglionic neuron in autonomic ganglion has an unmyelinated postganglionic axon that extends to the effector organ
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Question Answer
What are the divisions of the ANS?1. sympathetic division 2. parasympathetic division 3. dural innervation
Define dural innervationhaving visceral organs being served by both divisions, but causing opposite effects
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Question Answer
What are the roles of the parasympathetic division?1. promotes maintenance activities and conserves body energy 2. its activity is illustrated in a person who relaxes, reading, after a meal
What are some signs for the parasympathetic division?1. blood pressure, heart rate, and respirator rates are low 2. gastrointestinal tract activity is high 3. pupils are constricted and lenses are accommodated for close vision
What are the roles of the sympathetic division?(fight-or-flight) 1. mobilizes the body during activity; is the "fight-or-flight" system 2. promotes adjustments during exercise, or when threatened
What are some signs for the sympathetic division?1. blood flow is shunted to skeletal muscles and heart 2. bronchioles dilate 3. liver releases glucose
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Question Answer
What is the origin of the sympathetic fibers?thoracolumbar region of the spinal cord
What is the origin of the parasympathetic fibers?brain and sacral spinal cord (craniosacral)
What are the length of fibers for the sympathetic nervous system?short preganglionic and long postganglionic
What are the length of fibers for the parasympathetic nervous system?long preganglionic and short postganglionic
What is the location of ganglia for the sympathetic nervous system?close to spinal cord
What is the location of ganglia for the parasympathetic nervous system?in visceral effector organs
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Question Answer
Referred pain1. visceral pain afferents travel along the same pathway as somatic pain fibers 2. pain stimuli arising in viscera are perceived as somatic in origin
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