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Facilitated diffusion in cell membrane, showing ion channels and carrier proteins. Facilitated diffusion (also known as facilitated transport or passive-mediated transport) is the process of spontaneous passive transport (as opposed to active transport) of molecules or ions across a biological membrane via specific transmembrane integral proteins. [1]
Passive diffusion is the unassisted movement of molecules from high concentration to low concentration across a permeable membrane. [3] One example of passive diffusion is the gas exchange that occurs between the oxygen in the blood and the carbon dioxide present in the lungs. [4] Facilitated diffusion is the movement of polar molecules down ...
Passive learning is a traditional method utilized in factory model schools and modern schools, as well as historic and contemporary religious services in churches (sermons), mosques, and synagogues. Passive learning is not simply the outcome of an educational model. Passive learners may quietly absorb information and knowledge without typically ...
Passive diffusion across a cell membrane. Passive transport is a type of membrane transport that does not require energy to move substances across cell membranes. [1][2] Instead of using cellular energy, like active transport, [3] passive transport relies on the second law of thermodynamics to drive the movement of substances across cell ...
Observational learning suggests that an individual's environment, cognition, and behavior all incorporate and ultimately determine how the individual functions and models. [2] Through observational learning, individual behaviors can spread across a culture through a process called diffusion chain. This basically occurs when an individual first ...
Membrane transport protein. A membrane transport protein is a membrane protein involved in the movement of ions, small molecules, and macromolecules, such as another protein, across a biological membrane. Transport proteins are integral transmembrane proteins; that is they exist permanently within and span the membrane across which they ...
Facilitated diffusion in cell membranes, showing ion channels and carrier proteins. The resistance of a pure lipid bilayer to the passage of ions across it is very high, but structures embedded in the membrane can greatly enhance ion movement, either actively or passively, via mechanisms called facilitated transport and facilitated diffusion.
The blood–brain barrier (BBB) is a highly selective semipermeable border of endothelial cells that regulates the transfer of solutes and chemicals between the circulatory system and the central nervous system, thus protecting the brain from harmful or unwanted substances in the blood. [1] The blood–brain barrier is formed by endothelial ...