osmosis and diffusion

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Introductory Concepts in Biology
Diffusion and Osmosis

Diffusion

Movement of molecules from high to low concentration moves with the concentration gradient

No energy required

Examples: oxygen and carbon dioxide

Diffusion

Diffusion

Diffusion can occur to move molecules in and out of a cell through the cell membrane.

Diffusion can also occur within a cell (or fluid) to disperse molecules evenly throughout.

Diffusion requires no additional energy and is powered by the natural motion of the molecules.When would equilibrium be reached more quickly?

https://www.youtube.com/watch?v=9ghYur0vqgE

Osmosis

Special form of diffusion.

Water moves from high to low concentration across a semipermeable membrane.

Solute sucks water towards it.

Movement is from area of high (water) concentration to low (water) concentration.

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