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35 Cards in this Set
- Front
- Back
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Selectively permability is
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some substances can cross easier than others across the membrane
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Amphiphatic molecule is
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phospholipid both hydrophilic and phobil regions
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Fluid mosaic model is
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fluid structure with various proteins embedded in or attached to a double layer of phospholipids
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Membrane held by
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hydrophobic interactions and is fluid not locked
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Membrane remains as a fluid as
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temperature decreases until is solidifies (bacon greese)
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Integral proteins
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penetrate hydrophobil core of lipid bilayer
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Peripheral proteins are
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appendages loosely bound to surface of the membrane
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What dissolves in lipid bilayer?
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Hydrophobic molecules dissolve
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Hydrophobic core impedes
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hydrophilic and polar molecules
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Transport proteins are
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hydrophilic substances that use their channel to tunnel through membreans
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Diffusion is
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tendency for molecules to spread apart into available space
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Concentration gradient is
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Increase/decrease in density of chemicals in substance
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passive transport is
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a diffusion of a substance across a biological membrane
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Hypertonic is
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the higher solute concentration
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hypotonic is
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the lower solute concentration
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isotonic is
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solutions are equal concentrations
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Osmosis is
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diffusion of h20 across a selectively permeable membrane, water moves from hypotonic to hypertonic
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Osmoregulation is
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Control of water balance
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Turgid is
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firm cell wall, healthy
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Flaccid is
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limp cell wall, isotonic I think
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Plasmolysis is
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Plasma membrane pulls away from the wall
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Facilitated diffusion is
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Polar/ hydrophilic molecules pass with the help of proteins, some proteins specific to what they are transporting
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Aquaparins are
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water channel proteins
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Gated channels are
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stimulus close then to pen + close
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Active transport
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pump a molecule against it's gradient across a membrane, takes metabolic energy
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Membrane potential is
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voltage across a membrane
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Electrochemical gradient is
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Combination of forces anion and ion
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electrogenic pump is
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transport protein that generates voltage across a membrane
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Protein pump is
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actively transports hydrogen ions out of cell
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exocytosis
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cell secretes macromolecules by fusion of veicles with plasma membrane
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endocytosis
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cell takes in macromolecules and particulate matter
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Phagocytosis
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cell engulfs a particle by wrapping psuedopodia around it and packaging it within a membrane enclosed sac large enough to be classified as a vacuole
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Pinocytosis
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cell gulps droplets of extracellular fluid into tiny vessicles
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Recepto
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mediated endocytosis
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Ligands
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extracellular substance that binds to receptors
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