Cell transport is movement of materials across cell membranes. Cell transport includes passive and active transport:
Passive transport proceeds through (simple) diffusion, facilitated diffusion and osmosis.
Non-equilibrium statistical mechanics: from a paradigmatic model to biological transport
Simple diffusion
small non-polar molecules, like
Facilitated diffusion
Large or polar molecules passing through membrane protein channels. Examples of molecules that need protein channels:
Like water through aquaporins
Requires energy, for e.g. in the form of ATP.
https://en.wikipedia.org/wiki/Ion_channel
Sodium-potassium pump
https://www.brightstorm.com/science/biology/cell-functions-and-processes/cell-transport/