Water transport through the kidney

In occupational medicine, measurements of levels within the urine of toxic chemicals, or their metabolites, are used to indicate the level of exposure of workers to chemicals. In a worker’s body the kidney is the main organ taking care of the excretion of unwanted/toxic chemicals and the recovery of useful ones, via three mechanisms: filtration, reabsorption and secretion. We model these processes, taking the fairly complicated geometry of the kidney into account, and study how the flow rate of urine influences the concentration of certain drugs/toxins in a urine sample.