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17 Cards in this Set
- Front
- Back
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Diffusion
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Movement of molecules from an area Of higher concentration to an area of lower concentration
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Passive transport
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The movement of substances across a cell membrane without the use of energy by the cell.
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Concentration Gradient
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A difference in the concentration of a substance across a distance.
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Equilibrium
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The concentration of molecules will be the same throughout the space the molecules occupy
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Osmosis
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The process by which water molecules diffuse across a cell membrane from an area of higher con. to an area of lower concentration.
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Hypotonic
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Describes a solution whose solute concentration is lower than the solute concentration inside of the cell.
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Hypertonic
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Describes a solution whose solute concentration is higher than the solute concentration inside of the cell.
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Isotonic
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Describes a solution whose solute concentration is equal to the solute concentration inside of the cell .
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Contractile vacuole
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In Protists, an organelle that accumulates water and then releases it periodically to maintain osmotic pressure.
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Facilitated Diffusion
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The transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins.
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Carrier Protein
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A protein that transports substances across a cell membrane.
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Ion channel
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A complex of protein molecules in a cell membrane that from a life through which ions can pass
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Active Transport
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The movement of chemical substances, usually across the cell membrane, against a concentration gradient; requires cells to use energy.
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Sodium-potassium pump
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A carrier protein that uses ATP to actively transport sodium ions out of the cell and potassium ions into the cell.
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Endocytosis
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The process by which a cell membrane surrounds a particle and encloses the particle in a vesicles to bring the particle into the cell.
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Exocytosis
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The process by which a substance is released from the cell through a vesicles that transports the substance to a cell surface and then fuses with the membrane to let the substance out.
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Vesicle
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A small cavity or sac that contains materials in the eukaryotic cell; forms when part of a cell membrane surrounds the materials to be taken Into the cell or transported within the cell.
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