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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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Cichlids-The Knowledge

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Cichlids Cichlid is a large group of fish that is found in Africa with 1000 species, Central and South America with 300 species, India   with 3 species and North America with 1 species. The member of this group have enormous variety of color patterns, habitats and body forms. Ichthyologists have described a wide variety of feeding habits in cichlids. These fish include algae scrapers, like Eretmodus, that nip food with chisel-like teeth; insect pickers, like Tanganicodus; and snail eaters All cichlids have two pairs of jaws. The mouth jaws are used for scraping or nipping food and throat jaws are used for crushing or macerating food before it is swallowed. Many cichlid mouth brood their young. A female takes egg into her mouth after the eggs are spawned. She then inhales sperms released by male, and fertilization and development takes place within the female’s mouth! Even after the eggs hatch, younger are taken into the mouth of female if danger threatens. Hundreds of variations i
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