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21 Cards in this Set
- Front
- Back
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The movement ofparticles from an area of higher concentration to an area of lowerconcentration; does not require energy. The particles will continue to move until they are evenly dispersed.
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The process of maintaining stable internal environments. |
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The diffusion of water across a semi-permeable membrane.
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Themovement of substances across the membrane from areas of low concentration tohigh concentration; against the concentration gradientExocytosisEndocytosis(two types)Ion Pumps
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Movementacross a cell membrane without using energy. Moves from areas of high concentration to areas of low concentration;with the concentration gradient.DiffusionFacilitateddiffusionOsmosis
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Allowing only some materials to pass through the membrane.grv1
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Diffusionof larger molecules with the help of proteinsPassive transportn
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Cell Membrane |
The semipermeable membrane surrounding the cytoplasm of a cell; Composed of phospholipid bilayer
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Phospholipid |
Lipidcontaining a phosphate group.Polarhead is hydrophilicNonpolar tail ishydrophobic
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Fluid Mosaic |
Calledmosaic because of the various componentsFluid because of itslipid movement
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Concentration Gradient |
Difference in concentration of solutes in a solution in two regions.
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Osmotic Pressure |
Tendencyof water to move across a membrane based on the concentration of solutes oneach side.
Hypertonic– high osmotic pressure Hypotonic– low osmotic pressure Isotonic – equalosmotic pressure |
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Hypertonic Solution |
Concentration of solute is higher outside the cell Concentration of water is higher inside the cell Water moves out at a higher rate causing the cell to shrink |
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Hypotonic Solution |
Concentration of solute is lower outside the cell Concentration of water is lower inside the cell Water moves in at a higher rate causing the cell to swell |
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Isotonic Solution |
Concentration of solute and water are equal on both sides of the cell membrane Water moves in and out at a constant rate (equilibrium) |
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Endocytosis |
Takingin larger molecules by forming a vacuole from cell membrane; active transportPhagocytosis– ingesting solids
Pinocytosis –ingesting liquids |
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Exocytosis |
Fusion of a vacuole with the cell membrane and release of that substanceoutside; active transport
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Ion Pumps |
Use of ATP and proteins to pump ions across the membrane against theconcentration gradient (from low to high)
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Transport Proteins |
Responsiblefor moving materials in and out of the cell3types
Carrier– change shape to allow certain molecules across (involved in active transport)Channel– small openings for small molecules to diffuse through Gated – have gates orflaps that respond to certain stimuli |
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Marker Proteins |
Alsocalled glycoproteins because of carbohydrates they have. They are for identification like name tagsand function as part of the immune system
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Receptor Proteins |
For receiving signals from other cellsf the
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