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Homeostasis Intro.Doc Homeostasis Intro.Doc Presentation Transcript

  • Homeostasis Stable internal condition
  • Three requirements of living things
    • Exchanging gases (CO2 out; O2 in)
    • Taking in water, minerals, and food
    • Eliminating wastes
    • These tasks require molecules to move through the cell membrane.
  • Exchanging gases (CO2 out; O2 in)
    • Taking in water, minerals, and food
    • Eliminating wastes
    • These tasks require molecules to move through the cell membrane.
  • Molecule movement through membrane
    • Passive transport
      • No energy used by the cell
      • occurs naturally
    • Active transport
      • Requires energy by the cell to move molecules
  • Three functions of cell membrane
    • Separate contents of cell from its surroundings
    • Controls movement of materials into and out of cell
    • Interacts with the environment surrounding the cell
  • Cell Membrane http://www.wisc-online.com/objects/index_tj.asp?objID=AP1101
  • Diffusion
    • Movement of molecules from a region in which they are highly concentrated to a region in which they are less concentrated.
    • It will continue until the system reaches equilibrium, which means the molecules are randomly distributed throughout the system.
    • http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_diffusion_works.html
  • Equilibrium
    • Static- occurs when there is no action taking place
    • Dynamic-occurs when two opposing actions occur at the same rate but in opposite directions
  • Factors of diffusion
    • Amount of kinetic energy (temperature)
    • Size of the molecule
      • Smaller molecules will move faster than larger ones
    • Charges on the molecues
    • Nature of material molecules are moving through
  • Molecules permeable to cell membrane
    • Small molecues like:
      • CO2
      • O2
      • H2O
    • More oxygen would move into the cell then out if there is more oxygen outside the cell