TITLE sodium calcium exchange
NEURON {
SUFFIX myexchanger
USEION ca WRITE ica
USEION na WRITE ina
RANGE ImaxNax, ica, ina , KnNacx, KcNacx, inacx
GLOBAL dummy }
UNITS {
(mA) = (milliamp)
(mV) = (millivolt)
F = (faraday) (coulombs)
R = (k-mole) (joule/degC)
}
PARAMETER {
ImaxNax = 0.00208768267 (mA/cm2) KnNacx = 87.5 (mM) <0,1e6>
KcNacx = 1.38 (mM) <0,1e6>
}
ASSIGNED {
celsius (degC)
v (mV)
ica (mA/cm2)
ina (mA/cm2)
cao (mM)
cai (mM)
nao (mM)
nai (mM)
inacx (mA/cm2)
dummy
}
BREAKPOINT { LOCAL q10, Kqa, KB, k
k = R*(celsius + 273.14)/(F*1e-3)
q10 = 3^((celsius - 37)/10 (degC))
Kqa = exp(0.35*v/k)
KB = exp( - 0.65*v/k)
inacx = ImaxNax
ina = -3*inacx
ica = 2*inacx }