--f_ Lecture 8: Nervous systemo1. The nervous system is involved inphysiological regulation (control). of manysystems and in sensory input and motoroutput.The nervous system has two major functions:1) controls responses to the externalenvironment2) maintains homeoptasis by coordinatinginternal qrt&W'2. The.flEtKll* is the functional unit of thenervous system.Neuron: large cell body (usually located in CNS).fdh Fffilare cel processes which conveysignals to the cell boOy. Foillonductimpulses away from the cell body.! supporring ,"rrffi,ide support andrnp|i#rato aid ffinsmission of '.f#"jFunctional importance of this shape: increasedistance over which cell can transmit, i.e. needfewer cells.(Fig. a8.a)3. The nature of the nervous signal ispotentialenergy. ion concentrations inside and outsideneuron differ. concentration gradients exist acrossthe membrane. selectively permeable membrane, K*>>>Na*. concentration gradients are maintainedb by Na*-K* pumpsFormation of resting membrane potential - roleof
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