C
C There are a total of 3 entries in the algebraic variable array.
C There are a total of 1 entries in each of the rate and state variable arrays.
C There are a total of 9 entries in the constant variable array.
C
C
C VOI is time in component environment (second).
C STATES(1) is Na_int in component concentrations (mM).
C CONSTS(1) is Na_ext in component concentrations (mM).
C CONSTS(2) is K_int in component concentrations (mM).
C CONSTS(3) is K_ext in component concentrations (mM).
C CONSTS(4) is NH4_ext in component concentrations (mM).
C ALGBRC(1) is J_NaK_Na in component NaK (mM_per_s).
C ALGBRC(2) is J_NaK_K in component NaK (mM_per_s).
C ALGBRC(3) is J_NaK_NH4 in component NaK (mM_per_s).
C CONSTS(6) is K_Na in component NaK (mM).
C CONSTS(7) is K_K in component NaK (mM).
C CONSTS(8) is K_NH4 in component NaK (mM).
C CONSTS(5) is J_NaK_Na_Max in component NaK (mM_per_s).
C RATES(1) is d/dt Na_int in component concentrations (mM).
C
      SUBROUTINE initConsts(CONSTS, RATES, STATES)
      REAL CONSTS(*), RATES(*), STATES(*)
      STATES(1) = 0.0
      CONSTS(1) = 0.0
      CONSTS(2) = 39.0
      CONSTS(3) = 10.0
      CONSTS(4) = 0.0
      CONSTS(5) = 10.8
      CONSTS(6) =  0.200000*(1.00000+CONSTS(2)/8.33000)
      CONSTS(7) =  0.100000*(1.00000+CONSTS(1)/18.5000)
      CONSTS(8) = 1.00000
      CONSTS(8) =  0.200000*CONSTS(7)
      RETURN
      END
      SUBROUTINE computeRates(VOI, CONSTS,  RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      RATES(1) = CONSTS(8)
      RETURN
      END
      SUBROUTINE computeVariables(VOI, CONSTS, RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      ALGBRC(1) =  CONSTS(5)*STATES(1)/(STATES(1)+CONSTS(6)) ** 3.00000*CONSTS(3)/(CONSTS(3)+CONSTS(7)) ** 2.00000
      ALGBRC(2) = ( (- 2.00000/3.00000)*ALGBRC(1))/(1.00000+( CONSTS(4)*CONSTS(7))/( CONSTS(3)*CONSTS(8)))
      ALGBRC(3) =  ALGBRC(2)*CONSTS(4)/CONSTS(8) ** 1.00000*CONSTS(7)/CONSTS(3) ** 1.00000
      RETURN
      END