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V_i the volume of compartment i.

A complete set of differential equations for the 7-compartment model shown above could therefore be given by the following table:

The above equations include only transport terms and do not account for inputs or outputs. Those can be modeled with specific terms, as in the following.

Modeling inputs

Modeling inputs is necessary to come up with a meaningful description of a chemical's pharmacokinetics. The following examples show how to write the corresponding equations.

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