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21 Cards in this Set
- Front
- Back
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Cell Transport |
The movement of substance in and out of a cell |
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Passive Transport |
The movement of materials or substances down a concentration gradient Does not require energy |
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Diffusion |
Substances pass directly across the phospholipid bilayer |
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Facilitated Diffusion |
Substances use a channel or carrier protein to to diffuse across a membrane |
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Channel Protein Carrier Protein |
Form a channel across the cell membrane |
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Active Transport |
The movement of a substance against a concentration gradient Occurs with the help of transmembrane proteins |
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Cell Membrane |
-Protects the contents of the cell -Controls what enters and leaves the cell -Made of fat molecules |
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Transmembrane Proteins |
Form channels ,pumps, or receptors |
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Cholesterol |
Dispersed throughout the phospholipid bilayer and help the membrane stay fluid, or flexible |
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Diffusion of gases |
In a single celled organism,oxygen diffuses into the organism while carbon dioxide diffuses out |
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Diffusion of nutrients |
In unucellular organisms,simple nutrients diffuse into the organism while in multicellular organisms , simple nutrients diffuse from the intestines of the digestive system into the bloodstream |
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Equilibrium |
When the concentration of a substance is equal between two regions |
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Facilitated Diffusion |
Diffusion of a substance using a channel or carrier protein; a form of passive transport |
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Osmosis |
The movement of water from a high concentration of water region to a low concentration of water region; diffusion of water |
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Tonicity |
A measure to compare the concentration of water in two different solutions It compares concentration in terms of solute , not the solvent |
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Hypertonic Solution |
A solution that contains more solute than another solution |
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Hypotonic Solution |
A solution that contains less solute than another solution |
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Isotonic Solution |
A solution that contains the same concentration as another solution |
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Turgor Pressure |
When a plant cell is put in a hypotonic solution, water enters the cell, causing the cell membrane to push up against the cell wall, putting pressure on it |
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Osmotic Pressure |
The force ,or pressure, exerted by the "cell solution" that prevents water flow into the cell |
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Osmoregulation |
A mechanism that attempts to keep balance in the organism |
