Moving mat’ls across the selectively permeable cell membrane

Cell membrane will allow only certain things into the cell

Cell membrane only things out of the cell

3 layers

Controls what goes in and out of cell 2 layers of lipids, proteins in between

Water moves in or out of cell from high concentration to low concentration

Mat’ls move in and out of cell from high to low concentration

Amount of stuff in a certain space

Going from high to low concentration

move large or bulk materials across the membran INTO the cell Hint: endo -- into

moves large or bulk materials across the membrane OUT of the cell Hint: exo -- think exit

a form of diffusion that uses proteins to help move across the membrane.