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Passive processes
Diffusion:
The net movement of particles from an area of high concentration to an area of low
concentration.

Osmosis:
The net movement of water from an area of high water potential to an area of low water potential
through a selectively permeable membrane.

Facilitated diffusion:
When particles move…

Page 2

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How things actually get through a cell membrane:
Cell membranes are partially permeable, which means water can get through by
osmosis.
Big molecules like glucose get in through carrier proteins.
Charged ions (e.g. calcium) enter via the channel proteins, which can change their
charge to let them through.
Small molecules…

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