Which of the following is the result of an inward $\mathrm{Na}^{+}$current?

Question

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[III B 1 a, c, d, 2 a]. The upstroke of the action potential in the atria, ventricles, and Purkinje fibers is the result of a fast inward $\mathrm{Na}^{+}$current. The upstroke of the action potential in the sinoatrial (SA) node is the result of an inward $\mathrm{Ca}^{2+}$ current. The plateau of the ventricular action potential is the result of a slow inward $\mathrm{Ca}^{2+}$ current. Repolarization in all cardiac tissues is the result of an outward $\mathrm{K}^{+}$current.

Which of the Following Is the Result of an Inward Na+\mathrm{Na}^{+}Na+

Which of the Following Is the Result of an Inward $\mathrm{Na}^{+}$