This page allows you to iterate a model, given below, for a chemical's concentration,
c_{t}, in a pumping lung for a total of
N steps/breaths using selected values of the ambient concentration,
k, of the chemical in the environment. The
q variable is a number between 0 and 1 that can be interpreted as the ratio of the volume of a breath to the total volume of the lung or, more simply, the ratio of air exchanged. The model is given by the following first-order difference equation:
c_{t+1} = ( 1 - q ) c_{t} + q k
c_{0} is the initial condition -- the initial value of the concentration in the lung. Enter in the value of the parameters, then press the "Plot/Evaluate" button.