A new type of model called a department is formulated to complement the compartment. While a compartment may be dominated by convective transport, a department is dominated by diffusive transport. Although exit from a compartment is limited by the rate of biophysical or biochemical removal ("kC"), exit from a department is limited by the rate of transport to the site of biophysical or biochemical removal. (Journal of Parenteral and Enteral Nutrition 15:59S-64S, 1991)
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