passive transport


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Related to passive transport: bulk transport

transport

 [trans´port]
1. movement of materials in biologic systems, particularly across the cell membrane into and out of cells or across epithelial layers.
2. in the nursing interventions classification, a nursing intervention defined as moving a patient from one location to another.
active transport see active transport.
oxygen transport the carrying of oxygen through the bloodstream bound to hemoglobin (see oxyhemoglobin).
passive transport the movement of materials, usually across cell membranes, by processes not requiring expenditure of metabolic energy. See also active transport.

fa·cil·i·tat·ed trans·port

the protein-mediated transport of a compound across a biomembrane that is not ion-driven; a saturable transport system.
Synonym(s): passive transport

passive transport

n.
The movement of a chemical substance across a cell membrane without expenditure of energy by the cell, as in diffusion.

passive transport

the movement of small molecules across the membrane of a cell by diffusion. Passive transport occurs when the chemicals outside a cell become concentrated and start moving into the cell, changing the intracellular equilibrium. Passive transport is essential to various processes of metabolism, such as the intake of digestive products by the cells lining the intestines. Compare active transport, osmosis.

pas·sive trans·port

(pas'iv trans'pōrt)
The movement of particles or ions across a semipermeable membrane without the expenditure of energy. It is directly influenced by chemical or electrical gradients: the difference in the number of particles on either side of the membrane (chemical) or a difference in charged particles or ions (electrical).

passive transport

The movement of dissolved material through a biological membrane in the direction of fluid flow and without the expenditure of energy. Compare ACTIVE TRANSPORT.

passive transport

see DIFFUSION.

pas·sive trans·port

(pas'iv trans'pōrt)
The movement of particles or ions across a semipermeable membrane without the expenditure of energy.
References in periodicals archive ?
Results: High calcium diet increased the passive transport of mannitol and calcium while decreasing the active transport of calcium by the everted gut sacs.
The higher prevalence of perceived fatigue during bag carriage amongst adolescents in the high duration/ passive transport category suggests that these adolescents had poor muscular endurance compared to their peers in the high duration/active transport category.
However, the passive transport mechanism for lipid-soluble chemicals is not the only mechanism for chemicals to cross cell membranes.

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