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17 Cards in this Set
- Front
- Back
phospholipid
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Lipids with an attached phosphate group.
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selective permeability
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Feature the plasma membrane that maintains the cell's homeostasis by allowing some molecules into the cell while keeping others out.
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exocytosis
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Active transport process by which materials are expelled or secreted from a cell.
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facilitated diffusion
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Passive transport of materials across a plasma membrane by transport proteins embedded in the plasma membrane.
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transport protein
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Proteins that span the plasma membrane creating a selectively permeable membrane that regulates which molecules enter and leave a cell.
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fluid mosaic model
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Structural model of the plasma membrane where molecules are free to move sideways within a lipid bilayer.
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turgor pressure
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internal pressure of a cell due to water held there by osmotic pressure
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endocytosis
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Active transport process where a cell engulfs materials with a portion of the cell's plasma membrane and releases the contents inside of the cell.
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contraxtile vacuole
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organelle of some protists that collects excess water from the cell, then contracts and expells the water through the plasma membrane pore
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hypertonic
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In cells, solution in which the concentration of dissolved substances outside the cell is higher than the concentration inside the cell, causing a cell to shrink as water leaves.
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diffusion
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Net, random movement of particles from an area of higher concentration to an area of lower concentration, eventually resulting in even distribution.
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plasmolysis
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process resulting from a drop in turgor pressure as a result of water loss in a cell, causing the plasma membrane to shrink away from the cell wall
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hypotonic
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In cells, solution in which the concentration of dissolved materials is lower in the solution outside the cell than the concentration inside the cell, causing the cell to swell.
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isotonic
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In cells, solution in which the concentration of dissolved substances in the solution is the same as the concentration of dissolved substances inside the cell.
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dynamic equilibrium
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Result of diffusion where there is continuous movement of particles but no overall change in concentration.
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passive transport
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In cells, movement of particles across cell membranes by diffusion or osmosis; requires no expenditure of energy by the cell.
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osmosis
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Diffusion of water through a selectively permeable membrane depending on the concentration of solutes on either side of the membrane.
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