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Resting Membrane Potential
-90 mV in skel mm, -65 mV in neurons, -40 mV in photoRs (rel high Na+ chans open) and -85 mV in cardiac mm
K+ equi potential
(-)83mV (lower in skel mm) => > perm => much greater influence on resting memb pot than Na+
drug for cardiac failure that blocks the Na+/K+ ATPase in cardiac cells => inc [Ca2+]i -> inc contractile F
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