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Glossary of Physiology Terms -
Flux

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Flux

Definition:
The rate of movement of a substance across an interface. The interface could be the plasma membrane (separating the intracellular or extracellular fluid compartments), an epithelial sheet separating two compartments, or where two solutions of different composition meet.

Flux is reported as a rate. It is the amount of substance that moves across a given interface per unit time.

Related glossary terms/phrases:
Influx
Efflux
Unidirectional flux
Net flux




Posted: Friday, January 16, 2015
Last updated: Wednesday, March 12, 2025
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