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Cell Membrane Vocab
Vocab Words
8
Biology
9th Grade
10/29/2013

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Term
Selective Permeability
Definition
Allows some, but not all, materials to cross a membrane.
Term
Diffusion
Definition
The movement of molecules in a fluid or gas from a higher concentration to a lower concentration.
Term
Osmosis
Definition
Movement of water across a semipermeable membrane from higher to lower water concentration.
Term
Concentration Gradient
Definition
The difference in concentration of a substance from one location to another.
Term
Passive Transport
Definition
The movement of molecules across a cell membrane without energy input from the cell.
Term
Isotonic
Definition
A solution that has the same solute concentration as another solution.
Term
Hypotonic
Definition
A solution that has a lower solute concentration compared to another solution.
Term
Hypertonic
Definition
A solution that has a higher solute concentration compared to another solution.
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