A property of biological membranes that allows some substances to cross more easily than others.

Plasma membrane layers composed of phospholipid molecules arranged with polar heads facing the outside and nonpolar tails facing the inside.

repels water

Attracted to water

Phospholipid bilayer with proteins, cholesterol and carbohydrates

simple diffusion, facilitated diffusion, osmosis

passive transport and active transport

Transmit signals inside he cell

identifies chemical signals

separates the fatty acid chains from each other

Movement of molecules from an area of higher concentration to an area of lower concentration.

process of diffusion in which molecules pass across the membrane through cell membrane channels

Diffusion of water through a selectively permeable membrane

the movement of materials through a cell membrane using energy

the movement of substances across a cell membrane without the use of energy by the cell

Temperature, Concentration , Pressure

isotonic, hypotonic, hypertonic

A solution in which the concentration of solutes is essentially equal to that of the cell which resides in the solution

Solute concentration is greater than that inside the cell; cell loses water

Solute concentration is less than that inside the cell; cell gains water

process by which a cell takes material into the cell by infolding of the cell membrane

a process by which the contents of a cell vacuole are released to the exterior through fusion of the vacuole membrane with the cell membrane.