Type of transport Definition Does it require cellular...

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  Type of transport Definition Does it require cellular energy? Along or against the concentration gradient What is moving? Does it require a protein? Diffusion Diffusion describes the  movement of particles  from a region of high  concentration to a  region of low  concentration down a  concentration gradient.  No , diffusion does not  require cellular energy. Diffusion is along  the  concentration gradient. Small non-polar  molecules, CO 2 , O 2 steroids. No , diffusion does not  require a protein.  Osmosis Osmosis describes the  diffusion of water  particles across a  selectively permeable  membrane.  No , osmosis does not  require cellular energy.  Osmosis is along  the  concentration gradient.  Water molecules No , osmosis does not  require a protein.   Facilitated Diffusion Facilitated Diffusion is  a type of diffusion that  utilizes carrier proteins.  No , facilitated diffusion 
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Christopher Reinemann
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