If the extracellular [Na+] concentration is 140 mM, the intracellular [Na+] concentration is 5 mM, and the extracellular [Ca2+] concentration is 2 mM, what is the minimum intracellular concentration of Ca2+ (in mM) that can be maintained by the exchanger at equilibrium? Assume a membrane potential of 0 mV and a temperature of 298 K
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At the values below, how many moles of Na+ can be exported per mole of Ca2+ imported by a calcium-sodium exchanger. Intracellular Extracellular [Ca2+] 10 nM 1 μM [Na+] 20 mM 145 mM Membrane potential-60 mV (lower inside than outside) Temperature 37 °C
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