transport (redirected from Membrane transport proteins)

transport /trans·port/ (trans´port) movement of materials in biological systems, particularly into and out of cells and across epithelial layers.

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active transport  movement of materials in biological systems resulting directly from expenditure of metabolic energy.

(A) Passive transport exemplified by diffusion of potassium ions across the plasma membrane, through specific ion channels, down a concentration gradient; (B) active transport exemplified by the cellular sodium pump, which uses ATP hydrolysis to create gradients of sodium and potassium across the plasma membrane.

bulk transport  the uptake by or extrusion from a cell of fluid or particles, accomplished by invagination and vacuole formation (uptake) or by evagination (extrusion); it includes endocytosis, phagocytosis, pinocytosis, and exocytosis.

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trans·port (trnspôrt)

n.

The movement or transference of biochemical substances that occurs in biological systems.

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transport

[trans′pôrt]

Etymology: L, trans, across, portare, carry

the movement or transference of biochemical substances from one site to another. Active transport involves an expenditure of energy, whereas passive transport allows movement down a gradient without an energy expenditure.

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transport,

n the movement of biochemical substances from one site to another.

transport, active,

n transport of substances through membranes or epithelium, requiring metabolic energy.

transport, passive,

n transport along a gradient without the use of metabolic energy.

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transport

1. movement of materials in biological systems, particularly into and out of cells and across epithelial layers.

2. transport of animals, see transit, transportation.

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active transport

see active transport.

transport death

death during transportation, e.g. porcine stress syndrome.

transport host

see paratenic host.

transport media

see transport medium.

membrane transport proteins

specific proteins associated with the plasma membrane of cells that are responsible for transferring solutes including ions, sugars, amino acids, nucleotides and many metabolites across cell membranes.

transport myopathy

see exertional rhabdomyolysis.

transport stress

stress imposed by lack of access to water and feed, physical exhaustion caused by standing for long periods, heat stress, aggression by other animals.

transport tetany

see transit tetany.