ch 12 nervous system flashcards _ Quizlet

60 m v 60 v 70 m v q uizletcom7971136ch 12 ner vous

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Unformatted text preview: diffusion filtration diffusion a-d During an action potential, after the m em brane potential c q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 40/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet reaches +30 m V, w hich ev ent(s) prim arily affect(s) the m em brane potential? Voltagegated sodium channels begin to inactiv ate (close). Voltagegated sodium channels begin to inactiv ate (close) and the sodium potassium exchange pum p begins rem ov ing the excess sodium ions from the inside of the cell. Voltagegated sodium channels begin to inactiv ate (close) and v oltagegated potassium channels begin to open. Voltagegated potassium q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 41/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet channels begin to open and the sodium potassium exchange pum p begins rem ov ing the excess N a+ ions from the inside of the cell. a-d What ion d causes repolarizati on of the neuron during an action potential? Ca2+ (calcium ) Mg2+ (m agnesiu m) Na+ (sodium ) K+ (potassium ) a-d W ha t d causes repolarizati on of the m em brane potential during the action potential of a neuron? potassium q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 42/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet influx (entering the cell) sodium efflux (leav ing the cell) sodium influx (entering the cell) potassium efflux (leav ing the cell) a-d What is b prim arily responsible for the brief hy perpolari zation near the end of the action potential? the sodium /pot assium exchange pum p taking som e tim e to restore the norm al ion concentrati ons v oltagegated potassium channels taking som e tim e to close in response to the negativ e m em brane q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 43/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet potential v oltagegated potassium channels opening as the m em brane potential becom es m ore negativ e (repolarized ) v oltagegated sodium channels taking som e tim e to recov er from inactiv ation a-d Where are a action potentials regenerated as they propagate along an unm y elinat ed axon? at ev ery segm ent of the axon at m y elin at the nodes at the internodes a-d The c m ov em ent of w hat ion is q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 44/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet responsible for the local currents that depolarize other regions of the axon to threshold? v oltagegated sodium (N a+) channels Potassium (K+) sodium (N a+) calcium (Ca2+) a-d Approxim at d ely how fast do action potentials propagate in unm y elinat ed axons in hum ans? 0.1 m eters per second 1 20 m eters per second 1 2 m eters per second 1 m eter per second a-d I n contrast to the internodes of a m y elinated axon, the c q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 45/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet nodes ________ __. are w rapped in m y elin hav e higher m em brane resistance to ion m ov em ent hav e low er m em brane resistance to ion m ov em ent only occur at the beginning and end of the axon a-d Where are c acti...
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This note was uploaded on 11/04/2013 for the course CHEM 002 taught by Professor Vidensik during the Fall '10 term at UC Merced.

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