Plasma Membrane (Phospholipid Bilayer)

Hydrophyllic

Attracted to water

Hydrophobic

Water fearing

Selectively Permeable

Some things can go in, meanwhile others can not. (ions can not go through due to being charged, large molecules can not either)

Phosphate Heads (Sandwich Method)

Phosphate Head (Bread): They like water, so they face outward to the watery inside and outside of the cell)

Phospholipid Tails (Sandwich Method)

Phospholipid Tails (Filling): They hate water, so they hide in the middle, away from the water)

Proteins (Sandwich Method)

Proteins (Toppings): Stuck in or on the sandwich--some go all the way through, some sit at the top)

Plasma Membrane

Protects what goes in and what goes out

Diffusions

Movement of substances from high concentration to low concentration

Osmosis

Diffusion of water from low solute concentration to high solute concentration