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Cards In This Set
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Simple diffusion
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Description: movement of particles through the phospholipid bilayer or through channels from an area of high concentration to an area of low concentration that is, down the concentration gradient
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Examples of simple diffusion
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Movement of carbon dioxide out of all cells; movement of sodium ions into nerve cells as they conduct an impulse.
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Osmosis
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Description: diffusion of water through a selectively permeable membrane in the presence of at least one impermeant solute (often involves both simple and channel mediated diffusion).
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Example of osmosis:
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Diffusion of water molecules into and out of cells to correct imbalances in water concentration.
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Channel mediated passive transport (facilitated diffusion)
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Description: diffusion of particles through a membrane by means of channel structures in the membrane (particles move down their concentration gradient).
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Example of facilitated diffusion
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Diffusion of sodium ions into nerve cells during a nerve impulse.
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Carrier mediated passive transport (facilitated diffusion)
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Description: diffusion of particles through a membrane by means of carrier structures in the membrane (particles move down their concentration gradient).
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Example of carrier mediated passive transport, facilitated diffusion
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Diffusion of glucose molecules into most cells.
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