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secretion of material at the plasma membrane
sodium ions coupling with sugar molecules to enter cell
transport proteins move ions and small molecules into the membrane by carrier proteins
random motion of particles from an area of high concentration to low concentration
rate of diffusion affected by
pressure, concentration and temperature
diffusion of water across a selectively permeable membrane
when a cell in a solution has the same concentration of water and solutes as its cytoplasm in the cell
movement of substances across a concentration gradient requiring energy
amount of substance in a particular area
process by which a cell surrounds a substance in a portion of the plasma membrane and pinches it off leaving the substance inside the cell