Cell Membrane and Transport of Substances

• What is FACILITATED DIFFUSION ?

  • requires a CHANNEL PROTEIN in the CELL MEMBRANE to transport POLAR, CHARGED and WATER - SOLUBLE molecules across the membrane
• What is ENDOCYTOSIS ?

  • when particles are ENCLOSED in VESICLES made from CELL SURFACE MEMBRANE and transported INTO the cell(is an active process)
• What is EXOCYTOSIS ?

  • when VESICLES containing LARGE PARTICLES are FUSED with the CELL SURFACE MEMBRANE and transported OUT of the cells (is an active process)
• What are PARTIALLY PERMEABLE MEMBRANES composed of ?

  • SEA of PHOSPHOLIPIDS with PROTEIN MOLECULES between PHOSPHOLIPID MOLECULES

  •Membrane proteins consist of TRANSPORT proteins, RECEPTOR proteins, ENZYMES, STRUCTURAL and RECOGNITION PROTEINS