Transport ch. 7 section 3


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Transport ch. 7 section 3

  1. 1. CellularCellular TransportTransport
  2. 2. Functions of the cell membrane.Functions of the cell membrane. 1. Provides boundary for cell 2. Selectively permeable- only allows certain things to pass through- “Picky” Ex. Window screen 3. Maintains homeostasis: balance within the cells
  3. 3. Relate the structure of the cellRelate the structure of the cell membrane to its function.membrane to its function. Membrane isMembrane is a lipida lipid bilayerbilayer fluid-mosaic modelfluid-mosaic model Phospholipids:Phospholipids: fattyfatty areas that attractareas that attract (hydrophillic) and repel(hydrophillic) and repel (hydrophobic) water(hydrophobic) water Embedded proteins:Embedded proteins: “bouncers”“bouncers” 1.1. Decide who goes in &Decide who goes in & outout 2.2. Markers for recognitionMarkers for recognition
  4. 4. DiffusionDiffusion movement of particles from high to low concentration Ex. Perfume & Body odor OSMOSIS movement of water from high to low concentration. Both Go through bilayer Do NOT require cell energy (passive transport) Move until equilibrium is reached High concentration Low concentration Osmosis Diffusion
  5. 5. Cells in solutions.Cells in solutions.
  6. 6. Compare the three types ofCompare the three types of ISOTONICISOTONIC: same strength: same strength particles outside = particlesparticles outside = particles insideinside ISO- means “equal to”ISO- means “equal to” Movement into cell=Movement into cell= movement out of cellmovement out of cell
  7. 7. •HYPOTONIC: concentration of dissolved substances is lower outside cell than inside cell •HYPO means “below strength” •Water will move INTO cell causing it to swell (it always moves to where there is more substances) •Cells could rupture if the cell takes in too much water •This increases pressure inside of cell (TURGOR PRESSURE)
  8. 8. •HYPERTONIC: concentration of dissolved substances is higher outside the cell •HYPER means “above strength” •Water rushes OUT of cell causing it to shrivel (water rushes to where there is more substances) •Can result in PLASMOLYSIS in plants which causes wilting
  9. 9. •FACILITATED DIFFUSION: •type of diffusion since movement is from high to low concentration, but this type goes through a protein channel rather than bilayer. •Also Passive Transport •Proteins –picky “bouncers” Glucose molecules Protein channelLow Concentration High Concentration
  10. 10. ACTIVE TRANSPORT:ACTIVE TRANSPORT: transporttransport againstagainst concentration gradient;concentration gradient; goes fromgoes from low to highlow to high concentrationconcentration Go through proteinGo through protein channelchannel This requires energy toThis requires energy to move them into cell; ex:move them into cell; ex: Na-K pumpNa-K pump Molecule to be carried Molecule being carried Energy Low Concentration High Concentration
  11. 11. •Types of active transport: •ENDOCYTOSIS: cells take in large clumps of substances •Phagocytosis: “cell eating” take in food •Pinocytosis: “cell drinking” take in water •EXOCYTOSIS: cells move substances out(exit) ex: wastes
  12. 12. SummarySummary Diffusion & OsmosisDiffusion & Osmosis/ high to low conc./ go in between/ high to low conc./ go in between phospholipid spaces/ no energy=phospholipid spaces/ no energy= Passive transportPassive transport Facilitated DiffusionFacilitated Diffusion- high to low/ no energy/ goes through- high to low/ no energy/ goes through proteinprotein Active transportActive transport- low to high conc./ requires energy/ goes- low to high conc./ requires energy/ goes through proteinthrough protein Ex. PartyEx. Party `` 1. Air coming into a window screen1. Air coming into a window screen 2. Someone opens the door & you walk2. Someone opens the door & you walk through (door represents protein)through (door represents protein) 3. someone goes through the back door that is3. someone goes through the back door that is already openalready open *coming in=Endocytosis going out= Exocytosis*coming in=Endocytosis going out= Exocytosis