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:1/14/2019)... ... 2019 , ... Join the live session on ... topics in data quality, including:, ,     State of the art ...     Smartphone and wearable based performance measures ,     Data quality analytics ...
(Date:1/10/2019)... ... ... When Dr. James L. Sherley, M.D., Ph.D., founder and director of Massachusetts stem cell ... book Perinatal Stem Cells: Research and Therapy, he knew immediately what his topic would ... cell medicine. For more than a half-century, stem cell medicine has tried to ...
(Date:1/8/2019)... ... January 07, 2019 , ... Join industry experts Julie Peacock, Client ... live webinar on Thursday, January 17, 2019 at 1pm EST. , This ... during the clinical trial process. Featured speakers will also present a case study of ...
Breaking Biology News(10 mins):
Other biology definition