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Cell Transport Semipermeable membrane – small, lipid-soluble particles can pass, but large, charged particles cannot Diffusion – net movement of particles.

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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:

1 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

2 Cell Membrane

3 Diffusion

4 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.

5 Osmosis

6 Facilitated Diffusion Passive transport – no Energy required Moves down concentration gradient Moves through a carrier or channel protein Ex. Glucose Lipid-insoluble substances

7 Facilitated Diffusion

8 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

9 Active Transport – Sodium/Potassium Pump

10 Endocytosis Enodcytosis – cell taking materials in Pinocytosis – cell drinking Phagocytosis – cell eating

11 Endocytosis

12 Receptor-mediated endocytosis

13 Exocytosis Releasing molecules into the extracellular matrix Bulk flow – passage of substances through vessels or xylem/phloem

14 Exocytosis

15 Cell Junctions Plasmodesmata – tunnels between plant cells Junctions in animal cells – tight, anchoring, communicating

16 Tight, Anchoring and Communicating Junctions


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