Question

What is facilitated diffusion ?

Answer 1

moving of molecules from higher concentration to lower concentration is called diffusion

Answer 2

NCERT based Answer for Class 11 Biology Students

Facilitated Diffusion:

 It is Meant for hydrophilic substances which cannot pass through membrane.

 Special trans-membrane proteins help move substances across membrane without expenditure of ATP.

 Concentration gradient is required for transport of substances across membrane.

 Transport rate reaches a maximum when all protein transporters become saturated.  

 Very specific, a particular substance is transported by a particular protein.

 Transporter proteins are sensitive to inhibitors.

 Porins are proteins that form huge pores in outer membranes of plastids, mitochondria and some bacteria allowing molecules up to size of small proteins to pass through.

 Aquaporins are water channels.

 In a Symport, two type of molecules cross the membrane in the same direction.

 In an antiport, two types of molecules move in opposite directions.

 When a molecule moves across a membrane independent of other molecules, the process is called uniport.

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