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14 Cards in this Set
- Front
- Back
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Membrane transport |
The "geography" of cell membranes. |
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Extracellular |
Fluid on outside |
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Intracellular |
Fluid on inside (cytosol) |
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Membranes selective permeability |
Largely impermeable to ions and large particles but cell may use its own metabolic energy to help particles cross it's membranes. |
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Active transport |
Any mechanism in which a cell uses its own metabolic energy to move particles across its membranes |
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Metabolic pump |
Transport proteins in the membrane may bind to particles & carry them across the membrane by changing conformation. |
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Endocytosis |
Plasma membrane invaginates & pinches off vesicles containing "gulps" of the extracellular fluid. |
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Exocytosis |
Vesicles in the cytoplasm fuse w/ plasma membranes & release contents into extracellular fluid. |
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Passive transport |
The movement of particles across membrane w/o using the cells metabolic energy. *the kinetic energy of random molecular motion. |
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Diffusion |
The gradual spread of molecules from high concentration to one w/ lower concentration. |
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Osmosis |
The diffusion of water across a semi permeable membrane. Go from wet to dry/vice versa |
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Hypertonic |
When water moves from the inside to the outside. (Shrinks) |
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Hypotonic |
When water moves from outside to inside of the cell. (Swells) |
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Isotonic |
When water moves at equilibrium. |
