nerve study guide.docx - Nervous System ANATOMY AND...

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Nervous System ANATOMY AND PHYSIOLOGYBLOCK 8I. FUNCTIONS OF THE NERVOUS SYSTEM A.OVERVIEW Nervous System Involved in some way in nearly every body function Considered as a communication function Receiving signals from and sending commands to differentareas of the body Communication of the nervous system helps to coordinate thebody functions to maintain homeostasis A.FUNCTIONSMajor Functions of the Nervous System (RICME) Receiving Sensory Input Sensory receptors monitor external and internalstimuli We are aware sensations of vision, hearing,taste, smell, touch, pain, body position andtemperature because of the stimuli At subconscious levelblood pH, blood gases andblood pressure are processed Integrating information Major organs BrainSpinal cord Organs process sensory input and initiatingresponses Input may produce an immediate response bestored as memory or ignored Controlling muscles and glands Skeletal muscles normally contract whenstimulated by nervous system Thus, by controlling skeletal muscle, nervoussystem controls major movements of the bodyNervous system also participates in controllingcardiac muscle, smooth muscle and many glands Maintaining homeostasis Nervous system’s ability to detect, interpret and respond to changes in internal and external conditions System can stimulate or inhibit the activities of other systems to help maintain a constant internal environment Establishing and Maintaining Mental Activity Brain is center of mental activity including consciousness, memory and thinking II. DIVISIONS OF THE NERVOUS SYSTEM Nervous System Divided into Major divisionsCentral nervous systemBrainSpinal cordPeripheral nervous system All nervous tissue outside the central nervoussystem (nerves and ganglia) oFunctions to link CNS with various partsof the body oCarries information about the differenttissues of the body to the CNS andcarries commands from the CNS thatalter body activities ‘-70mv, -90 would represent hyper-polarization and +30 is the action potential.Sensory Division of PNSAlso known as afferent (toward) division Conducts action potentials from sensory receptors tothe CNS Sensory Neurons Neurons that transmit action potentials from theperiphery to the CNSMotor Neurons Neurons that transmit action potentials from the CNStoward the periphery Motor Divisions of PNSEfferent (away) divisionConducts action potentials from CNS to effector organssuch as muscles and glandsCan be subdivided by type of effector being innervated1 of 21OUTLINEI.Functions of the Nervous System Integumentary systemA.Overview II.Divisions of the Nervous systemA.Epidermis III.Cells of the nervous SystemA.

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