Transport protein that provides a tube like opening in the plasma membrane through which particles can diffuse

Channel proteins are a type of transport protein or permease that provides a tube like opening in the plasma membrane through which particles can diffuse through. This is primarily one distinction between the 2 mechanisms or processes of simple diffusion. Facilitated diffusion and simple or passive diffusion. The use of these specific proteins.

It allows water to resist freezing and thawing cycle.