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Ion channels and carrier proteins

This is a passive processes of membrane transport.

{ adapted from http://bcs.whfreeman.com/thelifewire8e/pages/bcs-main_body.asp?s=05000&n=00010&i=05010.01&v=&o=&ns=0&uid=0&rau=0 }

Ion channels:
Membrane proteins that allow rapid diffusion of ions through cell membranes.
These can be gated channels, where the channel can be opened or closed by certain conditions of chemicals.
ion membrane channels

Carrier proteins:
Bind to polar molecules such as sugars and amino acids and transport them across the membrane.
The maximum rate is limited by the number of carrier proteins in the membrane.
carrier membrane proteins

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