facilitated diffusion

• what is facilitated diffusion

  the passive transfer of polar molecules are charged ions down the concentration gradient via a channel or carrier proteins in the cell membrane
• what type of molecules are transported in facilitated diffusion

  ions and large polar molecules
• give examples of molecules transported by facilitated diffusion other than ions and large polar molecules

  sodium glucose and amino acids
• what affects the rate of facilitated diffusion through cell membrane

  amount of carrier proteins present in the membrane and the steepness of the concentration gradient
• what are the two types of transport proteins

  channel proteins and carrier proteins
• does facilitated diffusion require ATP


  no
• what is a channel protein in cell membrane

  this is a water-filled pore that allows water soluble molecules to pass through into the cell
• why is facilitated diffusion faster then simple diffusion

  passing through a protein channel is quire then diffusion though the bilayer
• what is a carrier protein in cell membrane

  this allows the diffusion of larger polar molecules such as glucose and amino acids by attaching the binding site,this causes the protein to change shape released in the molecule on the other side of the membrane
• what are the properties of substances transported by facilitated diffusion

  polar molecules and charged ions