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Bio 4B

Cell Transport

TermDefinition
Osmosis Movement of a solvent (usually water) from a low solute concentration to a high solute concentration in order to equalize the concentration of the two solutions. No energy required.
Diffusion Movement of both solvent and solute particles from high concentration to low concentration in order to equalize the concentration of the solution. No energy required.
Facilitated Diffusion Movement of specific molecules down a concentration gradient (from high concentration to low concentration) passing through the membrane via a specific carrier protein. No energy required.
Active Transport Movement of a substance across a cell membrane against its concentration gradient from lower concentration to higher concentration. Energy required.
Endocytosis Movement of very large molecules (into the cell) across the cell membrane through the fusion of vesicles. Energy required.
Exocytosis Movement of very large molecules (out of the cell) across the cell membrane through the fusion of vesicles. Energy required.
Solute Substance dissolved in another substance.
Solvent The substance that dissolves another substance.
Isotonic solution Concentration (amount) of solutes is equal on both sides of the cell membrane; this allows the flow of water through the cell membrane to be equal.
Hypertonic solution Concentration (amount) of solutes OUTSIDE of the cell membrane is GREATER than inside cell; this promotes a greater flow of water outside the cell thus leading to cell shrinking.
Hypotonic solution Concentration (amount) of solutes OUTSIDE of the cell membrane is LESS than inside the cell; this promotes a greater flow of water inside the cell thus leading to cell bursting.
Created by: tneal1