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Homeostasis Intro.Doc
 

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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