Biomedical Engineering: Bridging Medicine and Technology 1st Edition by Veronique Tran,Mark Saltzman

Exercise 20

Develop a better model for ingestion of a tracer, which includes two separate systems: one system representing the intestines (call it compartment 1) and another system representing the rest of the body (compartment 2).
a. Draw a block diagram showing the two systems with arrows connecting the inputs and outputs in appropriate ways.
b. Write a differential equation for the mass balance of tracer in each open system.
c. Show that the two equations are satisfied by functions of the form: where M is the amount of tracer in compartment 2 as a function of time, D is the amount of tracer in compartment 1 as a function of time, and A, B, and C are constants.