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13 Cards in this Set
- Front
- Back
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cell membrane |
-surrounds all cells -regulates what leaves and enters the cell -provides protection + support |
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lipid bilayer |
-2 layers made mainly of lipids -pourus semipermeable membrance -gives flexibility |
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concentration |
-the mass of solute in a given volume of solution |
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diffusion |
-the process by which molecules of a substance move from areas of high concentration to areas of low concentration |
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equilibrium |
- has been reached when the concentration of a solute is the same throughout the system |
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osmosis |
-the diffusion of water across a semipermeable membrane |
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osmotic pressure |
- force exerted on a selectively permeable membrane |
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2 types of transport in cells |
- facilitated diffusion (passive transport) - active transport |
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facilitated diffusion |
- protein channels that cross through a cell membrane and act as carriers to take large objects or charged molecules across the membrane -it will occur only if there is a higher concentration of a particular molecule on one side or the other - goes down a gradient/sledding (no required energy) |
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active transport |
-when substances move against c gradient, energy is required b/c it's going from high to low concentration - carries small molecules or ions across the membrane using pump-acting proteins - channels change shape (allows molecules in+through) (Ex: Endocytosis and Exocytosis) |
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endocytosis |
- movement of material out of a cell requires a great amount of energy - cells take in food as they invaginate take in food from vacuole and digest (phagocytosis - what ameba use- means cell eating, pinocytosis - cell drinking) |
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exocytosis |
- material leaves cell - vacuole fuses with cell membrane + releases material |
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turgor pressure |
- the pressure the membrane applies to the cell wall in plants - plasmolysis - in plants when we have a hypertonic solution - cytolysis - when a cell is put in a hypotonic solution |
