Question
Facilitated diffusion involving membrane proteins is categorised under passive transport. Why? Also draw a neat and labelled diagram showing facilitated diffusion.
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Answer
Facilitated diffusion involves special protein-lined channels or carrier proteins situated in cell membranes, which provide sites for the movement of molecules. They do not setup a concentration gradient it is already present and do not utilize energy. Since, energy is not used up in facilitated diffusion, it is called passive transport. 
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