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Figure 3 Current-voltage plots of ion channels. (a) An I-V curve of an ion channel that conducts positively charged ions. Above the equilibrium potential, there is outward current; below the equilibrium potential, there is inward current. An ohmic ion channel has a linear I- V relationship. (b) Rectifiers pass more current in one direction. I-V curves of ion channels that rectify curve upwards or downwards.

Figure 3 Current-voltage plots of ion channels. (a) An I-V curve of an ion channel that conducts positively charged ions. Above the equilibrium potential, there is outward current; below the equilibrium potential, there is inward current. An ohmic ion channel has a linear I- V relationship. (b) Rectifiers pass more current in one direction. I-V curves of ion channels that rectify curve upwards or downwards.

membrane potential initially create a strong driving force for Na + to enter the cell and can cause the membrane potential to approach ENa, (e.g., at the peak of action potentials).

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