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active transport

   Also found in: Dictionary/thesaurus, Medical, Legal, Financial, Wikipedia, Hutchinson 0.01 sec.
active transport [′ak·tiv ′tranz‚pȯrt]
(physiology)
The pumping of ions or other substances across a cell membrane against an osmotic gradient, that is, from a lower to a higher concentration.


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This finding was consistent with an active transport mechanism across the placenta.
Others have suggested that nitrate or the reduced form (nitrite) may pass to the fetus through a system of active transport similar to that of iodide, and fetal nitrate plasma levels may exceed that of the mother (Hartman 1982).
Interestingly, from a separate questionnaire sent home for parents to complete, the majority of parents (77%) stated they either walked or cycled to school themselves as 10-year-olds, indicating a substantial decrease in active transport in only one generation.
 
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