Facilitated Diffusion

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What is facilitated diffusion? In membrane, there are protein channels (pores) that allow polar molecules (soluble in water but not soluble in lipids) to move through them. The molecules that move through these channels never come into contact with the hydrophobic layer or the membrane's polar surface because these channels provide a continuous pathway for molecules that are moving through them. In this type of diffusion, like simple diffusion, no energy is consumed. Large and polar molecules require help to pass through the membrane. This help is done by a type of protein called carrier (transport) protein . To pass through the membrane, a molecules binds (temporarily) with carries protein in lipid bilayer and is transported from an area of higher concentration to an area of lower concentration.  Related topics: Simple Diffusion
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Wetland definition/Ramsar convention-The knowledge

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Wetland

 What are wetlands?

 Wetlands are the areas where water is primary factor that control the environment and associated plant and animal life.

Figure:Wetland
Ramsar

Wetlands are defined according to Ramsar convention as

“Areas of marsh,fen,peat land or water,whether natural or artificial,permanent or temporary,with water that is static or salt,including areas of marine the depth of which at low tide does not exceed six meters”.

(See Imortance of wetland)

(See Types of wetland)

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