(a) Facilitated diffusion of substances crossing the cell (plasma) membrane takes place with the help of proteins such as channel proteins and carrier proteins. Channel proteins are less selective than carrier proteins, and usually mildly discriminate between their cargo based on size and charge. (b) Carrier proteins are more selective, often only allowing one particular type of molecule to cross.
Cut Rita Zahara
“Facilitated Diffusion,” Open Educational Resource (OER) - USK Library, accessed December 2, 2023, http://uilis.usk.ac.id/oer/items/show/948.