action potential web quest：动作电位的web quest

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1、ActionPotentialWebQuestPart1–NeuronsGotohttp://health.howstuffworks.com/brain1.htmReadthetextandanswerthefollowingquestions.1.Whatisaneuron?_________________________________________________________2.Drawaneuronbelowandlabelthepartsintheboxbelow.Part2–TheSodium/PotassiumPumpGoto:http://www.broo

2、kscole.com/chemistry_d/templates/student_resources/shared_resources/animations/ion_pump/ionpump.htmlViewtheanimation1.Howmanypositivesodiumionsarebeingpumpedout?___________2.Howmanypositivepotassiumionsarebeingpumpedin?__________3.Sincethenumbersaredifferentcouldthiscauseanimbalanceofchargeone

3、ithersideofthemembrane?______________4.Whatmoleculeisprovidingtheenergyforthisiontransport?____________5.Whatistheprocesscalledwhenparticlesarebeingtransportedagainsttheconcentrationgradientacrossamembrane?___________________.Part3–TheNerveimpulse&SynapseGotohttp://www.bris.ac.uk/synaptic/publ

4、ic/basics_ch1_2.html1.Neuronsmaintaindifferentconcentrationsofcertainionsacrosstheircellmembranes.Whationisinhighconcentrationoutsidetheneuron?_____________________2.Whichionisinhighconcentrationinsidetheneuron?___________________3.Whatspecializedproteinexistsintheneuralcellmembrane?__________

5、________________4.Whatisitsfunction?__________________________________________________________5.Underrestingconditionswhichionleaksmore,thesodiumleakinginwardorthepotassiumleakingoutward?___________________________________________________________6.Theresultoftheleaksmakestheoutsideofthecellcha

6、rged________andtheinsideofthecellcharged________.Thecellissaidtobe____________.7.Sincesodiumisinhighconcentrationoutsideofthecellwhathappensifthesodiumchannelopensinthemembrane?Whichwaydoesthesodiummove?________________________.8.Thismakestheneuronmomentarily___________charged.Thecellissaidtob

7、e____________.9.Thisswitchinmembranepotentialisthe_________________________.10.Viewtheanimationtoseehowtheactionpotentialmovesdownthelengthofthecell(inonedirection).Summarizewhat’shappening.______________________________________________