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  2. Membrane transport protein - Wikipedia

    en.wikipedia.org/wiki/Membrane_transport_protein

    The yellow triangle shows the concentration gradient for the yellow circles and the purple rods are the transport protein bundle. Since they move down their concentration gradient through a transport protein, they can release energy as a result of chemiosmosis. One example is GLUT1 which moves glucose down its concentration gradient into the cell.

  3. Membrane transport - Wikipedia

    en.wikipedia.org/wiki/Membrane_transport

    Thermodynamically the flow of substances from one compartment to another can occur in the direction of a concentration or electrochemical gradient or against it. If the exchange of substances occurs in the direction of the gradient, that is, in the direction of decreasing potential, there is no requirement for an input of energy from outside the system; if, however, the transport is against ...

  4. Active transport - Wikipedia

    en.wikipedia.org/wiki/Active_transport

    Permitting one ion or molecule to move down an electrochemical gradient, but possibly against the concentration gradient where it is more concentrated to that where it is less concentrated, increases entropy and can serve as a source of energy for metabolism (e.g. in ATP synthase). The energy derived from the pumping of protons across a cell ...

  5. 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. [3] 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 ...

  6. 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 ...

  7. Cotransporter - Wikipedia

    en.wikipedia.org/wiki/Cotransporter

    This cotransporter family controls the concentration levels of potassium and chloride within cells through the combined movement of K + /H + and Cl − /HCO3 − exchangers or through combined movement of both ions due to concentration activated channels. The four known KCC proteins team up to form two separate subfamilies with KCC1 and KCC3 ...

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