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Passive Transport. Molecules can move across the cell membrane through passive transport. There are 3 types of passive transport. diffusion. osmosis. facilitated diffusion. Diffusion : Movement of molecules from an area of high to low concentration

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## Passive Transport

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**Molecules can move across the cell membrane through passive**transport. • There are 3 types of passive transport. • diffusion • osmosis • facilitated diffusion**Diffusion: Movement of molecules from an area of high to low**concentration • Movement continues until equilibrium is reached • Equilibrium: same amount of molecules on the outside of a cell as the inside**Diffusion (contd)**Where is the high Oxygen concentration? • Passive transport: No energy (ATP) required to move molecules • Molecule move down concentration gradients • C.G. = Difference in concentration from 1 area to another Where is the high CARBON DIOXIDE concentration?**O2**O2 O2 O2**O2**O2 O2 O2 O2 O2**O2**O2 O2 O2 O2 O2**Where is the HIGH oxygen concentration?**O2 O2 O2 O2 O2 O2 Where is the LOW oxygen concentration?**O2**O2 O2 O2 O2 O2**O2**O2 O2 O2 O2 O2**Where is the HIGH oxygen concentration?**Where is the LOW oxygen concentration? O2 O2 O2 O2 O2 O2 Cell X gets oxygen through the process of diffusion!**The reverse process is true w/ carbon dioxide.**CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2**Where is the HIGH carbon dioxide concentration?**CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2**CO2**CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2**CO2**CO2 CO2 CO2**Where is the HIGH carbon dioxide concentration?**CO2 CO2 CO2 CO2**CO2**CO2 CO2 CO2 CO2 CO2 CO2 CO2**CO2**CO2 CO2 CO2**Defined: Diffusion of water from an area of high to low**concentration High H20 concentration if: less particles dissolved in the water Low H20 concentration if: more particles dissolved in the water Osmosis**Facilitated Diffusion**• Defined: Larger molecules enter/exit with the help of protein channels in the plasma membrane • No energy is required • Q: Why are the molecules exiting this cell and not entering? • A: There are more molecules inside than out

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