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  2. Facilitated diffusion - Wikipedia

    en.wikipedia.org/wiki/Facilitated_diffusion

    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]

  3. Transcellular transport - Wikipedia

    en.wikipedia.org/wiki/Transcellular_transport

    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 the concentration gradient with the assistance of membrane proteins. Since the molecules associated with facilitated diffusion are polar ...

  4. Membrane transport protein - Wikipedia

    en.wikipedia.org/wiki/Membrane_transport_protein

    Facilitated diffusion in the cell membrane, showing ion channels (left) and carrier proteins (three on the right). Facilitated diffusion is the passage of molecules or ions across a biological membrane through specific transport proteins and requires no energy input. Facilitated diffusion is used especially in the case of large polar molecules ...

  5. Uniporter - Wikipedia

    en.wikipedia.org/wiki/Uniporter

    Facilitated diffusion may occur through three mechanisms: uniport, symport, or antiport. The difference between each mechanism depends on the direction of transport, in which uniport is the only transport not coupled to the transport of another solute. [4] Uniporter carrier proteins work by binding to one molecule or substrate at a time ...

  6. Membrane transport - Wikipedia

    en.wikipedia.org/wiki/Membrane_transport

    As mentioned above, passive diffusion is a spontaneous phenomenon that increases the entropy of a system and decreases the free energy. [5] The transport process is influenced by the characteristics of the transport substance and the nature of the bilayer. The diffusion velocity of a pure phospholipid membrane will depend on: concentration ...

  7. Mediated transport - Wikipedia

    en.wikipedia.org/wiki/Mediated_transport

    An example of an antiporter mediated transport protein is the sodium-calcium antiporter, a transport protein involved in keeping the cytoplasmic concentration of calcium ions in the cells, low. This transport protein is an antiporter system because it transports three sodium ions across the plasma membrane in exchange for a calcium ion, which ...

  8. This Body Type Is Linked to an Increased Risk of Developing ...

    www.aol.com/lifestyle/body-type-linked-increased...

    A specific type of body fat — visceral fat — around the midsection has been linked to the abnormal proteins that develop in the brain and are a hallmark of Alzheimer’s, according to findings ...

  9. Symporter - Wikipedia

    en.wikipedia.org/wiki/Symporter

    The movement of the ion(s) across the membrane is facilitated diffusion, and is coupled with the active transport of the molecule(s). In symport, two molecule move in a 'similar direction' at the 'same time'. For example, the movement of glucose along with sodium ions. It exploits the uphill movement of other molecules from low to high ...