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Lecture 24

BIOL 1201 Lecture 24: Nervous System, Smell, MusclesPremium


Department
Biological Sciences
Course Code
BIOL 1201
Professor
Moroney, James
Lecture
24

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BIOL1201Lecture24NervousSystem
NervousSystems
● Chapter48pages(10451061)
● Concepts48.1,48.2,48.3and48.4,
● Figures:48.5,48.6,48.7,48.8,48.10,48.11
● Parallelregulationofphysiologyandbehavior
● Threeoverlappingfunctions:
o Sensoryperceptioninputtransferredviatheperipheralnervoussystem
(PNS)
o MotoroutputsignalsfromtheCNScarriedviaPNStoeffectorcells
o Integrationinterpretationandinitiationofresponsesinthecentral
nervoussystem(CNS)
NerveCellStructure
● Neurons:
o Cellbodynucleusandorganelles
o Processes
▪ Dendritesconveysignalsfromtips
▪ Axonsconveysignalstowardtips
● Synapsejunctionbetweenneurons
● NeuronClasses
o Sensoryneurons:communicateinfofromsensoryreceptors
● Interneurons:communicateinfobetweenneurons
● MotorNeurons:conveyimpulsestoeffectorcells
NatureofNeuralSignalselectricalpotentialacrosstheplasmamembrane
● Signaldependsondifferencesinionconcentration,diffusionandactivetransport
● Membranepotential(Em)ismaintainedata“restingpotential”(about70mV)
● Membranepotential(Em)ismaintainedata“restingpotential”(about70mV)
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