Ionic Fluxes In The Cardiac Muscle Cells

Figure 7 summarizes some of the key changes in ion permeability that contribute to the cardiac action potential. The upper trace shows a typical cardiac action potential and the lower traces illustrate the changes in permeability to Na+, K+, and Ca2+. As a consequence of a depolarizing stimulus, a voltage-dependent increase in Na+ conductance occurs. A regenerative cycle is initiated, which tends to depolarize the cell toward the equilibrium potential of Na+. This regenerative increase in Na+ conductance rapidly moves the membrane potential to its peak level of +20 mV. Thus, the voltage-dependent increase in

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Get Rid of Gallstones Naturally

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