transport expenditure
1.transport of a substance across a cell membrane by diffusion; expenditure of energy is not required.
2.To transport(ions or molecules) against a concentration gradient by the expenditure of chemically stored energy.
3.Active transport: This process is characterized by selectivity and saturability and requires energy expenditure by the cell.
4.Active transport The transport of molecules or ions across a cell membrane against a concentration gradient, with the expenditure of energy, usually in the form of ATP.
5.transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy.
