Online A&P Week 7 – Guided StudyNervous System1.The nervous system functions tosenseschanges inside and outside the body. It theninterpretsthe changes that are senses andrespondsto the changes.2.The central nervous system (CNS) is composed of thebrainandspinalcord.It acts as thecontrol centerfor the body.a.Interpretive functions of the CNS includelearning,thinking, andmemory.b.The medulla oblongata is responsible for:found in brain stemc.The hypothalamus is responsible for:body temperature, heart rate, blood pressure3.The peripheral nervous system (PNS) acts as aconnectionbetween the CNS andreceptors,muscles,organs, andglands.a.afferentcells carry sensory informationtothe CNS frominternalorgansandsenses.b.efferentcells carry nerve impulsesawayfrom the CNS and are also calledmotor neurons.c.Thesomaticnervous system connects the CNS toskeletalmuscle, and controlsvoluntarystructures.i.Includes cranial nerves that originate in thebrainandspinal cord.d.Theautonomicnervous system connects the CNS toheartandsmoothmuscle,organsandglands. It controls structures that areinvoluntary.i.Regulatesinternalfunctions.e.The autonomic nervous system subdivides into thesympatheticandparasympatheticnervous systems.i.The sympathetic nervous system prepares the body foraction, like thefight or flightresponse. Itrelaxesthe intestinal walls andincreasessweating,heart rate, andblood flowto skeletal muscle.ii.The parasympathetic nervous system prepares the body forrestinganddigesting. Itcontractsthe intestinal walls and decreasessweating,heart rate,blood flowto skeletal muscle.