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Diffusion and Osmosis
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Cell Transport
Learning Objectives Describe passive transport. Describe active transport.
Passive Transport: Diffusion
Cell Membrane
Inside Cell
Outside Cell
Solutes
Higher concentration of solute on one side of the membrane than the other
Diffusion causes net movement of solute particles toward side of membrane with lower concentration.
At equilibrium, particles move equally in both directions, so there is no net change.
Passive Transport: Facilitated Diffusion
Passive Transport: Osmosis
aquaporin
water
cell membrane
sugar
Osmosis
Osmosis in Cells
Isotonic Hypertonic Hypotonic
Active Transport
Protein pumps Endocytosis Exocytosis
Endocytosis
Active Transport vs. Diffusion
Compare and contrast active transport and diffusion.
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