Active transport: Movement against a concentration gradient
Concentration: How many particles of a substance there are in a certain volume.
Diffusion: The net movement of particles from an area of high concentration to an area of low concentration
Osmosis: The net movement of water particles across a semi-permeable membrane from an area of high water potential to an area of low water potential
Semi-permeable membrane: A membrane that allows some particles through, but not all
Water potential: The concentration of water particles, or how dilute a solution is
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Section 2 j) Specification
2.77 understand that organisms are able to respond to changes in their environment Organisms have receptors to detect changes in the envir...
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