Passive Diffusion Across Cell Membranes - Science Illustration #96032 (License: Personal Use)

This scientific illustration depicts the process of passive diffusion, where small, nonpolar molecules traverse the phospholipid bilayer of a cell membrane. Initially concentrated in the extracellular space, the molecules move spontaneously into the intracellular space as time progresses, equalizing concentrations on both sides. The lipid bilayer’s hydrophobic interior allows only certain molecules to pass freely, illustrating selective permeability.

Used in biology and physiology educational content-textbooks, online courses, or lecture slides-to explain membrane transport mechanisms. Matches user intent for understanding basic cellular processes, especially passive diffusion vs. active transport.