Reactions

A non-spatial ODE model contains reaction rates that specify a rate of change of species total amount in a given compartment.

In a PDE model, we have two kinds of reactions

Compartment reactions
- take place everywhere within a compartment
- units: rate of change of species concentration
Membrane reactions
- take place on the membrane between two compartments
- units: rate of species amount crossing unit area of the membrane

When editing a reaction, an image of the location is displayed on the left, and the units are displayed below the reaction rate in the bottom right.