2.6

• • Tonicity - the strength of a solution
• • Solution - solute & solvent
• • Hypertonic - solute>solvent
• • Hypotonic - solute<solvent
• • Isotonic solute=solvent
• • Concentration gradient - the difference in concentration of a substance on one side of the membrane
• • Exergonic - energy is released
• • Ions are charged particles