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Facilitated diffusion

Biology  F1  FACS

Facilitated diffusion (or facilitated transport) is a process of diffusion, a form of passive transport facilitated by transport proteins. The facilitated diffusion may occur either across biological membranes or through aqueous compartments of an organism.

Facilitated diffusion (facilitated transport) is a process of passive transport (diffusion) via which molecules diffuse across membranes, with the help of transport proteins (mediated transport).

Facilitated Diffusion of Glucose
a concentration of glucose inside the cell of 0.5 millimolar (mM) and a
concentration of glucose outside the cell of 5 millimolar (mM)
a body temperature of 37C, so an absolute temperature of 37 + 273 = 310K, and ...

facilitated diffusion Diffusion of molecules across a plasma membrane with the assistance of carrier proteins (the term facilitated diffusion is used in opposition to passive transport).
faciocervical /FASH-ee-oh-SIR-vick-əl/ Pertaining to the face and neck.

facilitated diffusion
The spontaneous passage of molecules and ions, bound to specific carrier proteins, across a biological membrane down their concentration gradients.
facultative anaerobe ...

Allows diffusion of large, membrane insoluble compounds such as sugars and amino acids
Does not require energy (passive)
Highly Selective
Substance binds to membrane-spanning transport protein
Binding alters protein conformation, exposing the other surface ...

If charged particles or large molecules are to move across the membrane, another process needs to be found, as they are less soluble (or even insoluble) in lipid. They move through protein-lined pores.
Channel proteins ...

~ the movement of molecules across a membrane from a region of high concentration to a region of low concentration that is assisted by proteins.
Fallopian tubes the passageways that egg cells enter after release from the ovaries; also called oviducts.

~ Mediated transport in which a permease makes possible diffusion of a molecule across a cell membrane in the direction of a concentration gradient; contrast with active transport.

~ resembles chemical catalysis because the transported substances bind to permeases like substrates bind to enzymes and in addition, after one transport job is concluded, the permease is not consumed and can perform other successive transports.

~ the diffusion of a substance across a membrane, facilitated (assisted) by a protein carrier molecule
Fatty acid organic compounds that are usually found as constituents of lipids
Female an organism that produces female gamete (sex cells) ...

It is a process called ~. It could be as simple as bringing in a glucose molecule. Since the cell membrane will not allow glucose to cross by diffusion, helpers are needed. The cell might notice outside fluids rushing by with free glucose molecules.

~: Passive form of transport caused by the help of carrier proteins specific for the molecules they transport. Movement is always down the concentration gradient. Polar molecules and ions are usually moved in this fashion.

passive transport (~) - movement of a molecule across a membrane down its concentration gradient
peripheral membrane proteins-proteins that can be released from the membrane ...

It can either be done by simple diffusion or ~. Molecules will go from a region of high concentration to a region of low concentration as they move randomly and eventually become evenly distributed within the system if they are permeable to the membrane.

Some of these proteins can move materials across the membrane only when assisted by the concentration gradient, a type of carrier-assisted transport known as ~. Both diffusion and ~ are driven by the potential energy differences of a concentration gradient.

Carrier proteins are involved in ~ and active transport of substances out of or into the cell (e.g. diffusion of sugars, amino acids and nucleosides, uptake of glucose, transportation of salts, glucose, amino acids, etc.).

When a molecule moves down its concentration gradient using one of these membrane channels or transporters, the process is called ~. In ~, no input of energy is needed to move the molecules.

Because there's a lot of water on the outside not so much on the inside, that's like ~. Well how would you get that water to move from inside the boat where there's not so much back into the ocean?

Glucose enters cells by ~ via glucose carrier proteins
Cells have vesicles with extra carrier molecules present in their cytoplasm
Insulin binds to receptor in plasma membrane
Chemical signal → vesicles move towards plasma membrane ...

Protein-aided transport of an ion or molecule across a cell membrane down its concentration gradient at a rate greater than that obtained by passive diffusion; also called ~. Such transport exhibits ligand specificity and saturation kinetics.

The passive movement of molecules down their concentration gradient via transport proteins is called ~.
Two types of transport proteins facilitate the movement of molecules or ions across membranes: channel proteins and carrier proteins.

Loverdo C, Benichou O, Voituriez R, Biebricher A, Bonnet I, Desbiolles P: Quantifying hopping and jumping in ~ of DNA-binding proteins. ...

See also: See also: What is the meaning of Diffusion, Cell, Membrane, Trans, Protein?

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