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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Importance of wetland-The Knowledge

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 Importance of wetlands.

Wetland (See Wetland) are among the world's most productive environments.

Wetlands provide:

Source of recreation and tourism opportunities

•Hiking

•Fishing

•Bird watching

•Photography

•Hunting

Flood protection

•Wetland acts as natural buffers,soaking up and storing a significant amount of floodwater.

•A wetland can typically store about three-acre feet of water,or one million gallons.

•Wetlands are cradles of biological diversity

•They support high concentrations of

•Invertebrate species

•Fish

•Amphibians

•Birds

•Reptiles

•Mammals

•Wetlands are also important storehouses of plant genetic material.

Source of food

•Rice is a common wetland plant.

•Fisheries,over two thirds of world's fish harvest is linked to the health of wetland areas.

Other benefits

They are source of

•Timber and other building materials

•Energy resources

•Wildlife resources

Source of herbal medicines

Wetland provide a wide range of medicines

Medicinal leeches,Hirundo medicinalis used for

•Abscesses

•Painful joints

•Glaucoma

•Venous diseases

•Thrombosis

White willow,Salix alba,a riverine plant

al source of salicylic acid(SA)

•SA is a precursor of aspirine.

•Used in skin care products.

 (See Types of wetland )

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