ch 12 nervous system flashcards _ Quizlet

A b or c why does the action potential only m ov e aw

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Unformatted text preview: ial is fastest in w hich of the follow ing axons? a large unm y elinat ed axon a sm all unm y elinat ed axon a or b q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 22/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet a sm all m y elinated axon a b or c During a repolarizati on of a neuron potassium ions m ov e out of the cell. potassium ions m ov e into the cell. sodium ions m ov e out of the cell. sodium ions m ov e into the cell. both sodium and potassium ions m ov e into the cell a b c or d A threshold d stim ulus is the peak of an action potential. hy perpolari zation of an axon. resting potential. depolarizati on necessary to cause an action q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 23/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet potential. electrical current that crosses the sy naptic cleft a b c or d Puffer fish c poison blocks v oltagegated sodium channels like a cork. What effect w ould this neurotoxin hav e on the function of neurons? N eurons w ould depolarize m ore rapidly . N one, because the chem ically gated sodium channels w ould still function. The axon w ould be unable to generate action potentials. Action potentials w ould lack a repolarizati q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 24/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet on phase. The absolute refractory period w ould be shorter than norm al. a bcde In a a sy napse, neurotrans m itters are stored in v esicles located in the ________ __. presy naptic neuron sy naptic cleft postsy naptic neuron a b or c Binding of a c neurotrans m itter to its receptors opens ________ __ channels on the ________ __ m em brane. v oltagegated; postsy naptic v oltagegated; q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 25/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet presy naptic chem ically gated; postsy naptic chem ically gated; presy naptic a b c or d An action c potential releases neurotrans m itter from a neuron by opening w hich of the follow ing channels? chem ically gated Ca2+ channels v oltagegated N a+ channels v oltagegated Ca2+ channels v oltagegated K+ channels a b c or d Binding of a the neurotrans m itter to its receptor causes the m em brane to ________ __. either depolarize q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 26/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet or hy perpolari ze depolarize hy perpolari ze a b or c The b m echanism by w hich the neurotrans m itter is returned to a presy naptic neuron's axon term inal is specific for each neurotrans m itter. Which of the follow ing neurotrans m itters is broken dow n by an enzy m e before being returned? glutam ate acety lcholin e a or b When c cholinergic receptors are stim ulated, norepinephr ine deactiv ates q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 27/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet acety lcholin e. chloride ions leav e the postsy naptic neuron. sodium ions enter the postsy naptic neuron. chloride ions enter the postsy naptic neuron. sodium ions leav e the postsy naptic neuro a bcde O pioids b reliev e p...
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