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Transcript
Membrane Transport A quick review: Which substance is the solute and which is the solvent? Diffusion • Molecules move from an area of high concentration to an area of low concentration • “Down” their concentration gradient • Ex: Food coloring in water Transport Across the Membrane • The cell membrane is semipermeable • Small, nonpolar molecules can get through • Large, polar, or charged molecules need help from proteins to cross the membrane • Two types of transport: • Passive (no energy needed) • Active (energy needed) Diffusion • Passive Transport • No energy required Osmosis • Osmosis: when water diffuses across a membrane Solute Animation here Facilitated Diffusion • Molecules move down their concentration gradient through a carrier protein • Passive Transport • No energy required Active Transport • Moving molecules against their concentration gradient (low to high concentration) requires energy • Proteins found in the membrane move materials across with the help of ATP
