Presentation on theme: "Cell Transport Semipermeable membrane – small, lipid-soluble particles can pass, but large, charged particles cannot Diffusion – net movement of particles."— Presentation transcript:
Cell Transport Semipermeable membrane – small, lipid-soluble particles can pass, but large, charged particles cannot Diffusion – net movement of particles from high to low concentration Concentration gradient – the difference in concentration between one area and another
Osmosis Diffusion of water through aquaporins Moves from high water potential to low water potential. Hypertonic solution – higher solute concentration Hypotonic solution – lower solute conc. Isotonic soln. – solute conc. Equal on both sides and equilibrium.
Facilitated Diffusion Passive transport – no Energy required Moves down concentration gradient Moves through a carrier or channel protein Ex. Glucose Lipid-insoluble substances
Active Transport Not passive Goes up or against the concentration gradient (needs energy) Na + out/K + in Involves specific carrier proteins Important in muscle contractions, nerve impulses – maintains resting potential Ex. Plant roots, ion pumps