While scientists previously thought this component, called an anion exchange membrane ... ions move efficiently. With the ...

When an ion channel is open, ions move into or out of the cell in ... response to a signal and permit rapid ion movement across the cell membrane. The opening of just a single ion channel alters ...

In living cells, however, many proteins are not free to move. They are often anchored in place within the membrane by tethers ... some molecules can diffuse across the lipid bilayer but others ...

This takes place when molecules diffuse across the cell membrane by travelling through specific transport proteins. It occurs down a concentration gradient - molecules move from an area of high to ...

and is one of the ways substances can move across the cell membrane, into or out of the cell. Products of digestion, dissolved in water, can pass across the wall of the small intestine by diffusion.