CH 5 Definitions Flashcards
Define Selectively Permable Membrane
A membrane that allows only certain substances to pass through it
Define Diffusion
The movement of particles from an area of higher concentration to an area of lower concentration
Define Concentration Gradient
A difference in concentration of a substance between two areas
Define Osmosis
The diffusion of water across a selectively permeable membrane from an area of higher water concentration (or low solute concentration) to an area of lower water concentration (or high solute concentration)
Define Turgor Pressure
The outward pressure that is exerted on a plant cell wall by the cell contents when water is taken in by Osmosis
Define Endocytosis
The process by which a cell moves large amounts of material, or non-dissolved particles, into its cytoplasm from the outside environment
Define Phagocytosis
A type of endocytosis in which a cell uses pseudopods to move non-dissolved solid particles into its cytoplasm from the outside environment
Define Exocytosis
The process by which large amounts of material, or large non-dissolved particles, are moved from a cell’s cytoplasm to the outside environment
Define Permeable
Allowing passage
Define Impermeable
Not allowing passage