Movement in Cells & Revision

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Presentation transcript:

Movement in Cells & Revision Biozone: p76 – 78 Heinemann: 158 - 160

Method 1: DIFFUSION Used by unicellular organisms, and cells in your body. Basic Chemistry and Physics principles. Molecules possess kinetic energy, thus can move themselves ‘around’ – DISPERSAL.

Movement of a molecule from an area of high concentration to an area of low concentration until equilibrium is reached. Most often seen in gases, but applies to liquids also, in solution.

Method 2: OSMOSIS Used by unicellular organisms, and cells in your body. Basic Chemistry and Physics principles. More control than diffusion due to DIFFERENTIALLY PERMEABLE MEMBRANE. a.k.a. Selectively permeable membrane

Movement of water molecules from an area of low concentration to an area of high concentration through a differentially permeable membrane, until equilibrium is reached.

Description of solutions: Hypotonic Hypertonic

Method 3: ACTIVE TRANSPORT Specialised process. Breaks expectations of chemistry and physics. Against the concentration gradient, thus from low concentration to high concentration. Requires ENERGY.

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