This article is organized as follows. First, we describe the coupled background-consumption system, emphasizing how blockers or obstacles influence the concentration field in a crowded intracellular context. We then present the diffusion, hydrodynamic, and reaction models used for both analytical and numerical calculations. A detailed analysis of the concentration field and velocity of a test BMC in the presence of both passive and active blockers is provided. Finally, we discuss broader implications of these blocking effects for intracellular transport.