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Unformatted text preview: of the membrane. 8. The ______________ pumps sodium out and potassium into the cell, restoring ion concentrations to their resting levels. 9. Where is calcium stored in the contractile cells? ________________ 10. Gap junctions allow what cations to pass into the cardiac contractile cells, causing the opening of voltage-gated sodium channels? ________________________ 11. State the voltage-gated channels responsible for the following stages of the action potential in cardiac contractile cells: a. Depolarization ______________________ b. Plateau ______________________ c. Repolarization ______________________ 12. What channels in the autorhythmic cells allow ions to leak in, producing a pacemaker potential? (Quiz section) ______________ 13. What channels in the autorhythmic cells bring about depolarization? _____________....
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- Spring '08