For each scenario, choose which boundary condition would be appropriate. Consider and list what assumptions you might be making. 1.The solute of interest is diffusing towards the cell membrane, where it is binding to surface receptors. 2.Sugar is diffusing from the surface of a dissolving sugar cube. 3.Blood is flowing over an oxygen transport membrane in a blood oxygenator. 4.Nutrients are diffusing away from the epithelium in a capillary bed into the tissue. Describe the boundary where diffusion of solute from one capillary meets that of another if you assume regular spacing of capillaries.

For each scenario, choose which boundary condition would be appropriate. Consider and list what assumptions you might be making. 1.The solute of interest is diffusing towards the cell membrane, where it is binding to surface receptors. 2.Sugar is diffusing from the surface of a dissolving sugar cube. 3.Blood is flowing over an oxygen transport membrane in a blood oxygenator. 4.Nutrients are diffusing away from the epithelium in a capillary bed into the tissue. Describe the boundary where diffusion of solute from one capillary meets that of another if you assume regular spacing of capillaries.