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24 Cards in this Set
- Front
- Back
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maintains proper concentrations inside a cell |
plasma membrane |
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quality of allows passage of some materials in and out of the cell |
selectively permeable |
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membrane is also called... |
the lipid bilayer |
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are also in the lipid bilayer and act as gates |
proteins |
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membrane won't always look the same, constantly changing, and is made of small pieces |
fluid mosaic model |
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diffusion only occurs |
from a higher concentration to a lower one |
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difference in concentration between regions |
concentration gradient |
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things move with the _______ |
gradient |
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When the particles are evenly distributed |
equilibrium |
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what are three things that enter a cell by diffusion |
water, oxygen, and carbon dioxide |
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diffusion of water particles |
osmosis |
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more substances dissolved outside the cell than in |
hypotonic |
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what does hypotension do to the appearance of a cell |
makes it swell |
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what pushes on the cell's wall |
turgor pressure |
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Why do animal cells sometimes burst |
they have no cell wall |
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what can remove excess water |
vacuoles |
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more substances dissolved outside the cell than in |
hypertonic |
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what does hypertension do to the appearance of a cell |
makes it look shriveled |
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loss of water and turgor pressure |
plasmolysis |
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same amount of dissolved substance in and out, cell retains shape |
isotonic solution |
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when a cell uses energy to transport substances against the gradient |
active transport |
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acts as a gate that change shape to move things through the bilayer |
proteins |
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cell engulfs the molecule to get it into the vacuole |
endocytosis |
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how wastes are expelled |
exocytosis |
