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Encyclopedia > Facilitated diffusion
facilitated diffusion in cell membrane, showing ion channels and carrier proteins

Facilitated diffusion (or facilitated transport) is a process of diffusion, a form of passive transport, where molecules diffuse across membranes, with the assistance of transport proteins. Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... diffusion (disambiguation). ... Passive transport bobo means of moving biochemicals, and other atomic or molecular substances, across membranes. ... 3D (left and center) and 2D (right) representations of the terpenoid molecule atisane. ... Look up cell membrane in Wiktionary, the free dictionary. ... A transport protein is a protein involved in facilitated diffusion. ...

Charged ions dissolve in water and diffuse through water channel proteins. These ion channels are gated so they can open and close, thus regulating the ion flow. Larger molecules diffuse through carrier proteins that change shape as the molecules are carried through, for example glucose and amino acids. ... A representation of the 3D structure of myoglobin, showing coloured alpha helices. ... In science, a molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties. ... Glucose (Glc), a monosaccharide (or simple sugar), is an important carbohydrate in biology. ... In chemistry, an amino acid is any molecule that contains both amino and carboxylic acid functional groups. ...

Small uncharged molecules can easily diffuse across the plasma membrane. However, due to the hydrophobic nature of the lipids that make up the plasma membrane, water-soluble molecules and ions cannot do so; instead, they are helped across by transport proteins. The transport protein involved is intrinsic(transmembranal), that is, it completely spans the membrane. It also has a binding site for the specific molecule such as glucose, or ion to be transported. After binding to the molecule, the protein changes shape and carries the molecule across the membrane, where it is released. The protein then returns to its original shape, to wait for more molecules to transport. Hydrophobe (from the Greek (hydros) water and (phobos) fear) in chemistry refers to the physical property of a molecule that is repelled by water. ... Some common lipids. ... Glucose (Glc), a monosaccharide (or simple sugar), is an important carbohydrate in biology. ...

A biological membrane or biomembrane is an enclosing or separating tissue which acts as a barrier within or around a cell. ... Passive transport bobo means of moving biochemicals, and other atomic or molecular substances, across membranes. ... diffusion (disambiguation). ... Osmosis is the net movement of water across a partially permeable membrane from a region of high solvent potential to an area of low solvent potential, up a solute concentration gradient. ... Sodium-Potassium pump, an example of Primary active transport secondary active transport Active transport (sometimes called active uptake) is the mediated transport of biochemicals, and other atomic/molecular substances, across membranes. ... example of Primary active transport Primary active transport directly uses energy to transport molecules across a membrane. ... secondary active transport In secondary active transport, in contrast to primary active transport, there is no direct coupling of ATP; instead, the electrochemical potential difference created by pumping ions out of the cell is used. ... Neuron A (transmitting) to neuron B (receiving) 1. ... Endocytosis (IPA: ) is a process whereby cells absorb material (molecules such as proteins) from the outside by engulfing it with their cell membrane. ... Steps of a macrophage ingesting a pathogen: a. ... Transcytosis is the process by which various macromolecules are transported across the interior of a cell. ... Pinocytosis or cell drinking is one of three forms of endocytosis, a cellular process that is used to take up smaller particles in cell by splitting in small particles , and forms vesicles which then merge with lysosomes to hydrolyze (hydrolytic enyzmes) to break down the particles. ... Pinocytosis Non-specific, adsorptive pinocytosis is a form of endocytosis, a process in which small particles are taken in by a cell by splitting off small vesicles from the cell surface. ...

  Results from FactBites:
Facilitated Diffusion (365 words)
Their transport must therefore be "facilitated" by proteins that span the membrane and provide an alternative route or bypass.
Facilitated diffusion is the name given this process.
It is similar to simple diffusion in the sense that it does not require expenditure of metabolic energy and transport is again down an electrochemical gradient.
Diffusion, facilitated transport, osmosis, and active transport. (467 words)
Diffusion is the movement of molecules from an area where the molecule is in high concentration to an area where the molecule is in lower concentration.
Facilitated diffusion is the movement of a molecule from an area of high concentration to an area of lower concentration with the help of a protein channel or carrier.
In the facilitated diffusion animation both amino acids and glucose are shown entering the cell facilitated by a protein carrier.
  More results at FactBites »



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