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Unformatted text preview: resPonses). PNS: several components that are different in organization & function cranial nerves and sPinal nerves' The motor (efferent)division is divided in the autonomic and somatic nervous systems' a?-The autonomlc system is 'involuntary' and conveys signals that regulate the internal environment, e.g. cardiac muscle rn" ,o#tic nervous system sends signals to skeletal muscle,'voluntaq/ mainly in response to external stimuli. Parasympathetic: e n ha nces activiti es wh ich ga i n and conserve E: e.g. slows heart, increase activity of intestines Sympathetic: E expenditures and prepare individual for action: e.g. accelerates heart, dilat:e gupils' decrease activity of gut- 4q' wv' 9. Central nervous system has a high degree of cePhalization Regional speation in motor and surface area devoted t rb...
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- Fall '10