Passive Transport, Diffusion, and Osmosis

Explain the passive transport processes of diffusion and osmosis.
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active transport
Movement across a membrane during which molecules move form an area of low concentration to an area of high concentration; against the concentration gradient; uses ATP.
carrier protein
Transport protein that aids in diffusion by carrying a glucose molecules across the membrane; has one binding site.
channel protein
Transport protein that aids in diffusion by creating a passageway through the membrane for ions; has a specific shape and charge.
diffusion
Movement of molecules from an area of high concentration to an area of low concentration; down the concentration gradient. Moves oxygen, carbon dioxide, vitamin A, and ethyl alcohol.
facilitative diffusion or facilitated diffusion
Diffusion in which assistance by a transport protein is required; is a passive transport process.
ion
Charged atom; atom that has gained or lost one or more electrons; also known as electrolytes or salt.
passive transport
Requires NO energy, Movement of molecules from high to low concentration, Moves down the concentration gradient.
simple diffusion
Diffusion is which molecules freely move across the membrane; no assistance by proteins is necessary.
concentration gradient
A difference in the concentration of substances within a distance; compare substances of the extracellular fluids to the intracellular fluids.
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