#membranes

2 articles

Osmosis: Why Water Moves on Its Own

Osmosis is the passive diffusion of water — not solute — across a semipermeable membrane toward the more concentrated side, driven by chance and stopped only when water potential equalizes.

10 min read·Jul 30, 2026

Biology

Cell Membranes and Transport

How a self-assembling lipid bilayer becomes a selectively permeable barrier, why diffusion and osmosis move solutes for free while pumps spend ATP to push them uphill, and how those hard-won gradients power the rest of physiology.

10 min read·Jul 13, 2026