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Cell Transport

TermDefinition
Phospholipid Bilayer 2 layers of phospholipids arranged tail-to-tail. Main component of the cell membrane. Creates a barrier between the cytoplasm and the fluid around the cell.
Transport Proteins Facilitate the movement of certain substances, like sugar, across the membrane.
Selective Permeability A key property of the cell membrane. Some substances can pass through the membrane will keeping other substances out.
Diffusion The movement of particles from an area where there are many particles of a substance to an area where there are fewer particles of the substance.
Dynamic Equilibrium Continuous movement of particles, but no overall change in concentration.
Facilitated Diffusion A form of passive transport that uses transport proteins to move ions and small molecules across the plasma membrane.
Osmosis The diffusion of water across a selectively permeable membrane.
Isotonic Solution A solution that contains the same concentration of water and solutes as the cell.
Hypotonic Solution A solution that has a lower solute concentration compared to the cell.
Hypertonic Solution A solution that has a higher solute concentration compared to the cell.
Active Transport The movement of substances across the plasma membrane that requires energy and moves against the concentration gradient.
Passive Transport The movement of substances across the plasma membrane that does not require energy and moves with the concentration gradient.
Endocytosis The process by which a cell surrounds a substance in the outside environment, enclosing the substance in a portion of the plasma membrane.
Exocytosis The removal of substances at the cell membrane.
Solvent The substance that is doing the dissolving.
Solute The substance that is being dissolved.
Concentration gradient A difference in concentration of a substance between solutions.
Created by: user-1733795
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