The diffusive transport of chemical species within the endocrine system allows for the distribution of hormones across cellular membranes. Hormones like insulin must diffuse through interstitial spaces to reach their target cells. For example, the diffusion of insulin through the extracellular matrix is essential for glucose uptake by cells . However, the efficiency of diffusion can be modulated by factors such as molecular size, temperature, and the medium through which they diffuse. Chemical reactions, such as hormone-receptor interactions, enzymatic conversions, and degradation, are crucial for the activation, inactivation, and regulation of hormones. For example, the conversion of proinsulin to insulin via enzymatic cleavage is a critical step in regulating blood glucose levels . These biochemical reactions are influenced by local concentrations of reactants and products, which are inherently linked to diffusion dynamics.