chapter 3 Biological foundations

Touchingaheatsource thebrain

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ityofthousandsofneurotransmitterstotheir specifictransmitters The Nervous System  ­  ­ Sensoryneuronscarryinputmessagesfromsenseorganstothespinalcordandbrain  ­ Motorneurons organs  ­ Interneuronsperformconnectiveorassociativefunctionswithinthenervoussystem  ­ Thenervoussystemcanbedividedintothecentralnervoussystem:whichconsistsofallthe neuronsinthebrainandspinalcordandtheperipheralnervoussystem:whichiscompsedofall theneuronsthatconnectthecentralnervoussystemwiththemuscles,glands,andsensory receptors Peripheral Nervous System  ­ Ithelpscarryouttheinputandoutputfunctionsthatarenecessaryforustosensewhatis happeninginsideandoutsideourbody  ­ Ithas2divisions,thesomaticnervoussystemandtheautonomicnervoussystem SomaticNervousSystem  ­ Consistsofsensoryneuronsthatarespecializedtotransmitmessagesfromtheeyes,ears,and othersensoryreceptors  ­ Italsohasmotorneuronstocontrolourvoluntarymovement  ­ Theaxonsofsensoryneuronsgrouptogethertoforsensorynervesandthemotorneurons combinetoformmotornerves AutonomicNervousSystem  ­ Controlsthebody’sinternalenvironmentsuchasthesmoothmuscles,thebloodvessels,and digestivesystem  ­ Ithastwodivisions:thesympatheticnervoussystemandtheparasympatheticnervoussytem  ­ Thesympatheticnervoussystemhasanactivationorarousalfunctionandtendstoactasaunit o Eg.Whenyouarestressedyourheartpumpsmoreblood,pupilsdilate,anddigestionslows downsobloodcangotomuscles(fightorflight)  ­ Parasympatheticnervoussystemismorespecificandhastheoppositeeffectofthesympathetic one o Itslowsdownbodyprocessesandmaintainsastateoftranquility o Itworksinbalancewiththesympatheticnervoussystemtomaintainhomeostasis,a balancedinternalstate The Central Nervous System  ­ Containsthespinalcordandthebrain SpinalCord  ­ Mostnervesenterandleavethecentralnervoussystembywayofthespinalcor...
View Full Document

Ask a homework question - tutors are online