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Diffusion the movement of any molecule from high to low concentration and requires no energy. Osmosis special type of diffusion which is the movement of water from an are of high to low concentration cell membrane part of the cell that regulates what can and cannot enter the cell Phospholipid bilayer The core of nearly all cell membranes is a double-layered sheet called a equilibrium When an environment is equal on both side of them membrane lipid bilayer the core of nearly all cell membranes is a double-layered sheet. concentration is the mass of solute in a given volume of solution, or mass/volume. selective permeability property of biological membranes that allows only certain substances to pass through ( it is like a shark tank or a screen door) facilitated diffusion movement of specific molecules across cell membranes through protein channels. active transport energy-requiring process that moves material across a cell membrane against a concentration difference. endocytosis process by which a cell takes material into the cell by infolding of the cell membrane. phagocytosis process in which extensions of cytoplasm surround and engulf large particles and take them into the cell ( "cell eating" ) exocytosis process by which a cell releases large amounts of material.