Navigation Links
Facilitated diffusion


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).

Small uncharged molecules can easily diffuse across cell membranes. However, due to the hydrophobic nature of the lipids that make up cell membranes, water-soluble molecules and ions cannot do so; instead, they are helped across by transport proteins. The transport protein involved is intrinsic, that is, it completely spans the membrane. It also has a binding site for the specific molecule (e.g., glucose) or ion to be transported. After binding 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.

In contrast to active transport, facilitated diffusion does not require energy and carries molecules or ions down a concentration gradient.


'"/>


(Date:11/21/2014)...   Atmel® Corporation (NASDAQ: ATML ... technology solutions, today launched the industry,s first family of ... V cc range from 1.7V to 5.5V. The ... 2 C bus communication speeds, and are available with ... ideal for consumer, industrial, computer, and medical applications. ...
(Date:11/15/2014)... -- While we may still be a few years away from ... to gain instant access to all that ailed his patients, ... tablets for monitoring and measuring our health are cropping up ... a tad Orwellian to some, but a new survey suggests ... opportunities into their healthcare regime. These are some ...
(Date:11/7/2014)... Nov. 7, 2014  In conjunction with the ... Departments, The Community Foundation of the Verdugos has announced the ... JUSTICE PROJECT," a $250,000 initiative to keep the Verdugo Regional ... its first six months of existence, the Lab has processed ... for local law enforcement. "Because our number one ...
Breaking Biology News(10 mins):Atmel Launches Industry's First Wide-V(cc) Low-Power Temperature Sensor Family 2Atmel Launches Industry's First Wide-V(cc) Low-Power Temperature Sensor Family 3Atmel Launches Industry's First Wide-V(cc) Low-Power Temperature Sensor Family 4Americans May Be Ready for a Brave New World of Healthcare 2Americans May Be Ready for a Brave New World of Healthcare 3Americans May Be Ready for a Brave New World of Healthcare 4Community Foundation Of The Verdugos Unveils Campaign To Fund Glendale-Burbank DNA Justice Project 2
... London, New Delhi, Singapore and Washington DC (July 27, ... of Medical Decision Making , a large-scale, covert ... resources even with an extremely effective public health response, ... and initiating a response to it. The article ...
... 2009) An Italian research team, publishing in the ... is now available on-line without charge at http://www.ingentaconnect.com/content/cog/ct ... placenta may ultimately play a role in the treatment ... diseases caused by tuberculosis, chemical exposure, radiation or pathogens. ...
... Royal Holloway, University of London, has discovered evidence that ... frogs. The research, published in the August edition of ... about our long-tongued friends: wild frogs in the UK ... conducted her research with colleagues from the Institute of ...
Cached Biology News:Bioterrorism and disaster preparedness explored in special issue of Medical Decision Making 2Placenta-derived stem cells may help sufferers of lung diseases 2Disease threat may change how frogs mate 2
Other biology definitionOther Tags