Cell Membrane Transport

Cell Membrane Transport

1. Passive Transport

   • Do not use energy
     • Molecules move with concentration gradient.
       • High to low.
         • Diffusion
           • Is the movement of molecules in a fluid or gas from a region of higher concentration to a region of lower concentration.
         • Osmosis
           • Move across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration.
         • Facilitated Diffusion
           • Is the diffusion of molecules across a membrane through transport proteins.
       • A concentration gradient is the difference in the concentration of a substance from one location to another.

2. Active Transport

   • Use energy
     • Molecules move against concentration gradient.
       • Active Transport
         • Drives molecules across a membrane from a region of lower concentration to a region of higher concentration.
       • Exocytosis
         • The opposite of endocytosis, is the release of substances out of a cell by the fusion of a vesicle with the membrane
       • Endocytosis
         • Phagocytosis
           • Is a type of endocytosis in which the cell membrane engulfs large particles.Liquid Particles
         • Pinocytosis
           • Particles solid
         • Is the process of taking liquids or fairly large molecules into a cell by engulfing them in a membrane.