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TITLE sodium calcium exchange
: taken from jwm simulation
NEURON {
SUFFIX nacax
USEION ca READ eca WRITE ica
USEION na READ ena WRITE ina
RANGE k, ica, ina, ex
}
UNITS {
(mA) = (milliamp)
(mV) = (millivolt)
}
PARAMETER {
k = .0002 (mho/cm2) <0,1e6>: at 6.3 deg. Q10 of 3
}
ASSIGNED {
celsius (degC)
v (mV)
eca (mV)
ena (mV)
ica (mA/cm2)
ina (mA/cm2)
ex (mV)
}
LOCAL s_celsius, Q
BREAKPOINT {LOCAL kca
if (s_celsius*1(degC) != celsius) {
s_celsius = celsius
Q = 3^((celsius - 6.3)/10 (degC))
}
ex = 2*ena - eca
ina = 2*k*Q*(v - ex)
ica = -ina/2
}
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