Cell Transport

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Cell Transport
2010-09-19 23:44:29
biology cell transport

Various methods of cell transport, both passive and active
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  1. diffusion (passive)
    definition: molecules or ions move from regions of higher concentration to regions of lower concetration

    example: exchange of oxygen and carbon dioxide in lungs, spreading of perfume throughout a room
  2. facilitated diffusion (passive)
    definition: same as diffusion, except carrier molecules move substances through membrane

    example: moving glucose through cell membrane
  3. osmosis (passive)
    definition: water molecules move from high concentrations of water to low concentrations of water

    example: water entering a cell
  4. filtration (passive)
    definition: molecules move from high hydrostatic pressure (water pressure) to low hydrostatic pressure

    example: kidneys filitering waste
  5. active transport (active)
    definition: carrier protiens move molecules from low concentration to high concentration

    example: moving amino acids
  6. endocytosis (active)
    definition: too large molecules enter cell through a vesicle

    • example: pinocytosis is the membrane eating liquid droplets
    • phagocytosis is the membrane eating particles
    • receptor-mediated endocytosis uses specific receptors to carry molecules into cell
  7. exocytosis (active)
    definintion: vesicles for around particles that need to be expelled from membrane

    example: secretion of hormones, cell removing waste