MOD 15 PASSIVE TRANSPORT MECHANISM

• Membrane transport refers to the collection of mechanisms that regulate the passage of sollutes such as ions and small molecules through biological membranes, which are lipid bilayers that contain proteins embedded in them
• Type of membrane transport

  PASSIVE AND ACTIVE
• Passive transport can be simple diffusion or facilitated diffusion
• Diffusion occurs when particles spread. They move from a region where they high concentration to low concentration
• Simple diffusion small non charged molecules or lipid soluble molecules pass between phospholipids to enter or leave the cell
• Osmosis type of diffusion where molecules of water are moving from high concentration of water to less water concentration by passing through semi permeable membrane.
• Facilitated Diffusion uses transport proteins to move ions and other small molecules across the plasma membrane
• Facilitated Diffusion process whereby a substance passes through membrane with an aid of an intermediary or facilitator
• Facilitator integral membrane protein spans the width of the membrane
• Oxygen and carbon dioxide are most lipids enter and leave the cell by simple diffusion