Cell Transport

Cards (6)

  • What is simple diffusion?
    The net movement of molecules from an area of high concentration to an area of low concentration down a concentration gradient
  • What molecules enter and leave cells via simple diffusion through the cell membrane?

    Small molecules e.g. oxygen, water, glucose, amino acids
  • What factors affect the rate of diffusion? (3)
    • Temperature
    • Concentration gradient
    • SA of cell membrane
  • Define osmosis.
    The net movement of water molecules from an area of high water concentration to an area of low water concentration through a partially permeable membrane
  • What is active transport?
    The movement of molecules across a cell membrane from an area of low concentration to an area of high concentration, against the concentration gradient, using energy.
  • How is a percentage change in mass calculated?
    percentage change = (change in mass/ initial mass) x 100